2BSQE-GMC-500GMC-500+ Geiger Counter

GMC-500+ Geiger Counter User Guide GQ Electronics LLC Revision 2.0 Sep-2020 2 Document Revision History: Re 2.00, Aug-2020 Added Dosimeter Mode Re.1.50, Sep-2018 Content revise Re.1.40, Sep-2018 Content revise for hardware v2.00 Re.1.30, Sep-2018 Data saving related content revised. Re.1.20, Sep-2017 Re.1.01, Apr-2017 Re.1.00, Feb-2017 3 Table of Contents User Guide .................................................................................................................................. 1 Table of Contents ......................................................................................................................... 3 Overview ......................................................................................................................................... 5 Specifications: ......................................................................................................................... 5 Packing List: ............................................................................................................................ 6 How it works? ................................................................................................................................... 6 Caution ............................................................................................................................................. 6 Background Safe Levels ................................................................................................................... 6 Hardware setup ...................................................................................................................... 7 Software set up ....................................................................................................................... 7 Verify USB driver installation in Windows .................................................................................... 8 S1 key ...................................................................................................................................... 9 S2 key ...................................................................................................................................... 9 S3 key ...................................................................................................................................... 9 S4 key ..................................................................................... Error! Bookmark not defined. Power saving mode ................................................................................................................ 9 Popup Windows .................................................................................................................... 10 Graphic User Interface (GUI) ...................................................................................................... 10 Graphic Icons: ....................................................................................................................... 10 Dual Display Modes ....................................................................................................................... 12 Display Modes ................................................................................................................................ 13 Graphic Mode: ...................................................................................................................... 13 Text Mode: ............................................................................................................................ 13 Large Font Mode: ................................................................................................................. 14 User Option ........................................................................................................................... 16 Alarm Set ............................................................................................................................... 16 Date and Time setting .......................................................................................................... 17 Data Saving Setting.............................................................................................................. 17 Threshold Data Saving Setting ........................................................................................... 18 Add Note or Add Location for data saving ......................................................................... 18 Note/Location Input .............................................................................................................. 19 Erase Saved History Data ................................................................................................... 19 Display Option....................................................................................................................... 19 Swivel Display Option ........................................................................................................... 19 WiFi Setup and Check ......................................................................................................... 20 WiFi IP address .................................................................................................................... 20 WiFi Mac address ................................................................................................................. 20 WiFi Signal Level Checking ................................................................................................. 20 Internet Data Server Setting ................................................................................................ 21 Website server ...................................................................................................................... 21 URL for Website server ........................................................................................................ 21 Website server User ID .......................…

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GQ Electronics LLC Covered Equipment Certification Attestation Letter 11/19/2025 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 USA ATTN.: Reviewing Engineer FCC ID: 2BSQE-GMC-500 GQ Electronics LLC (“the applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. Note: If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, the applicant should include an explanation on why the equipment is not “covered” equipment. GQ Electronics LLC (“the applicant”) certifies that, as of the date of the filing of the application, the applicant is not identified on the Covered List (as a specifically named entity or any of its subsidiaries or affiliates) as an entity producing “covered” equipment. GQ Electronics LLC (“the applicant”) certifies that the equipment for which authorization is sought does not include cybersecurity or anti-virus software produced or provided by Kaspersky Lab, Inc. or any of its successors and assignees, including equipment with integrated Kaspersky Lab, Inc. (or any of its successors and assignees) cybersecurity or anti-virus software pursuant to DA-24-886 and KDB 986446 D01 Covered Equipment Guidance section B(2a). Signed: Printed name: Limin Zhang Title: Manager Company Name: GQ Electronics LLC Date: 11/19/2025

GQ Electronics LLC U.S. Agent Letter of Attestation To: Federal Communications Commission 7435 Oakland Mills Road, Columbia, MD 21046, USA Date: November 19, 2025 Ref: Attestation Statement – Part 2.911(d)(7) filing FCC ID: 2BSQE-GMC-500 GQ Electronics LLC (“the applicant”) certifies that, as of the date of the filing of the application, GQ Electronics LLC (“the agent”) is our designated U.S. agent for service of process for the above reference FCC ID. The applicant accepts to maintain an agent for service of process in the United States for no less than one year after either the grantee has permanently terminated all marketing and importation of the applicable equipment within the U.S., or the conclusion of any Commission- related administrative or judicial proceeding involving the equipment, whichever is later. The applicant further acknowledges it is our responsibility to inform the FCC whenever the agent information changes. GQ Electronics LLC ("the agent) understand it is the agent's obligation to accept service of process in the United States for matters related to the applicable equipment, and at the physical U.S. address and email address. Designated U.S. Agent Company Name: GQ Electronics LLC FRN: 0037611639 Address: 1001 SW Klickitat Way, Suite 110, Seattle WA 98134 Signature: Contact Person: Limin Zhang Tel: 206-829-8093 Email: [email protected] Applicant Company Name: GQ Electronics LLC FRN: 0037611639 Address: 1001 SW Klickitat Way, Suite 110, Seattle WA 98134 Signature: Contact Person: Limin Zhang Tel: 206-829-8093 Email: [email protected]

DATE: November 19, 2025 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: 2BSQE-GMC-500 Product Name: GMC-500+ Geiger Counter Request for Confidentiality Pursuant to Sections 0.457 and 0.459 of the commission’s rules, we hereby request that the following documents be held confidential: (List here the documents for which you are seeking confidentiality – for example ...)  Schematics  Block diagram  Operation description These materials contain trade secrets and proprietary information and are not customarily released to the public. The public disclosure of this information might be harmful to the company and provide unjustified benefits to our competitors. <Signature> Name: Limin Zhang Title: Manager Company: GQ Electronics LLC

Date: November 19, 2025 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 RE: LETTER OF AGENT AUTHORIZATION To Whom It May Concern: We, the undersigned, hereby authorize Compliance Testing, LLC to act on our behalf in all matters relating to application for equipment authorization, including the signing of all documents relating to these matters. We also hereby certify that no party to the application authorized hereunder is subject to the denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.853(a). Sincerely, <Signature> Name: Limin Zhang Title: Manager Company: GQ Electronics LLC

DATE: November 19, 2025 Federal Communications Commission Authorization & Evaluation Division 7345 Oakland Mills Road Columbia, Maryland 21046 Authority to Act as Agent On our behalf, I appoint Shenzhen CCUT Quality Technology Co., Ltd. (1F, Building 35, Changxing Technology Indstrl Park Changzhen Community, Yutang Street,Shenzhen,China) to act as our agent in the preparation of this application for equipment certification. I certify that submitted documents properly describe the device or system for which equipment certification is sought. I also certify that each unit manufactured, imported or marketed, as defined in the Federal Communications Commission’s regulations will have affixed to it a label identical to that submitted for approval with this application. For instances where our authorized agent signs the application for certification on our behalf, I acknowledge that all responsibility for complying with the terms and conditions for certification, still resides with GQ Electronics LLC (1001 SW Klickitat Way, Suite 110, Seattle WA 98134). <Signature> Name: Limin Zhang Title: Manager Company: GQ Electronics LLC

GQ Electronics LLC Model Difference Statement FCC ID: 2BSQE-GMC-500 DATE: November 19, 2025 Dear Sir/Madam, Added models GMC-500, GMC-500 PRO basis of the original product GMC-500+.The color of appearance and model name of series models listed are different from the main model, but the circuit and the electronic construction are the same, declared by the manufacturer. Sincerely, Name: Limin Zhang Company name: GQ Electronics LLC Address: 1001 SW Klickitat Way, Suite 110, Seattle WA 98134

Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report Annex A. EUT External Photos Model: GMC-500+ EUT View 1 EUT View 2 Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report EUT View 3 EUT View 4 Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report EUT View 5 EUT View 6 Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report EUT View 7

Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report Annex D. Label and Inf ormation FCC Label Sample FCC Label Specifications Text is Black in color and is justified. Labels are printed in indelible ink on permanent adhesive backing or silk-screened onto the EUT or shall be affixed at a conspicuous location on the EUT. Where the EUT is constructed in two or more sections connected by wires and marketed together, the above statement is required to be affixed only to the main control unit. When the EUT is so small or for such use that it is not practicable to place the statement on it, the above information shall be placed in a prominent location in the instruction manual or pamphlet supplied to the user or, alternatively, shall be placed on the container in which the device is marketed. FCC Label Location

Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report Annex B. EUT Internal Photos Model: GMC-500+ EUT Internal View 1 EUT Internal View 2 Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report EUT Internal View 3 EUT Internal View 4 PCB ANT

FCC ID: 2BSQE-GMC-500 RF Exposure Evaluation According to KDB 447498 D01 General RF Exposure Guidance v06 and part 2.1093，Unless specifically required by the published RF exposure KDB procedures, standalone 1-g head or body and 10-g extremity SAR evaluation for general population exposure conditions, by measurement or numerical simulation, is not required when the corresponding SAR Test Exclusion Threshold condition(s), listed below, is (are) satisfied. For 100 MHz to 6 GHz and test separation distances ≤ 50 mm, the 1-g and 10-g SAR test exclusion thresholds are determined by the following: [(max. power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)] · [√f(GHz)] ≤ 3.0 for 1-g SAR, and ≤ 7.5 for 10-g extremity SAR, where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation The result is rounded to one decimal place for comparison Here, The device has been evaluated to meet general RF exposure requirement. The device can be used in portable exposure condition without restriction. For 2.4GWiFi Max Conducted Power(dBm) Tune-up Power(dBm) Max Tune-up Power(dBm) Max Power(mW) Frequency(MHz) Min. distance(mm) Calc. thresholds limit 7.46 7(±1) 8 6.31 2462 5 1.980174 3.0 So a SAR test is not required

Page 1 of 3 1. General Inf ormation 1.1 Antenna Information Manufacturer: GQ Electronics LLC Address of Manufacturer: 1001 SW Klickitat Way, Suite 110, Seattle WA 98134 Product Name: 2.4GHz Antenna Model Name: GMC-500+ Frequency Range: 2412MHz - 2462MHz Type of Antenna: PCB Antenna Antenna Gain: 0dBi (Max.) Impedance: 50 ohm Antenna View: Length * Width (18mm * 7.2mm) Page 2 of 3 2. Antenna Specification inf ormation 2.1 Gain Frequency Peak Gain (dBi) Polarity 2412MHz 0 Horizontal 2412MHz -0.3 Vertical 2437MHz -0.6 Horizontal 2437MHz -0.2 Vertical 2462MHz -0.9 Horizontal 2462MHz -0.3 Vertical Page 3 of 3 2.2 Radiation Pattern View

Report No: DSP25100168-1E FCC Test Report Page 1 of 48 FCC TEST REPORT FCC ID: 2BSQE-GMC-500 Report No. : DSP25100168-1E Applicant : GQ Electronics LLC Product Name : GMC-500+ Geiger Counter Model Name : GMC-500+ Test Standard : FCC Part 15.247 Date of Issue : 2025-11-28 Shenzhen CCUT Quality Technology Co., Ltd. 1F, Building 35, Changxing Technology Industrial Park, Yutang Street, Guangming District, Shenzhen, Guangdong, China; (Tel.:+86-755-23406590 website: www.ccuttest.com) This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd. Report No: DSP25100168-1E FCC Test Report Page 2 of 48 Test Report Basic Information Applicant..................................: GQ Electronics LLC Address of Applicant...............: 1001 SW Klickitat Way, Suite 110, Seattle WA 98134 Manufacturer..........................: GQ Electronics LLC Address of Manufacturer........: 1001 SW Klickitat Way, Suite 110, Seattle WA 98134 Product Name.........................: GMC-500+ Geiger Counter Brand Name.............................: GQ Main Model..............................: GMC-500+ Series Models..........................: GMC-500, GMC-500 PRO Test Standard..........................: FCC Part 15 Subpart C KDB 558074 D01 15.247 Meas Guidance v05r02 ANSI C63.4-2014 ANSI C63.10-2020 Date of Test .............................: 2025-10-15 to 2025-11-28 Test Result...............................: PASS Tested By ................................: (Walker Wu) Reviewed By............................: (Lorzix Luo) Authorized Signatory............: (Lahm Peng) Note : This test report is limited to the above client company and the product model only. It may not be duplicated without prior permitted by Shenzhen CCUT Quality Technology Co., Ltd.. All test data presented in this test report is only applicable to presented test sample. Report No: DSP25100168-1E FCC Test Report Page 3 of 48 CONTENTS 1. General Information ....................................................................................................................................................5 1.1 Product Information .............................................................................................................................................5 1.2 Test Setup Information..........................................................................................................................................6 1.3 Compliance Standards ...........................................................................................................................................7 1.4 Test Facilities ........................................................................................................................................................7 1.5 List of Measurement Instruments ..........................................................................................................................8 1.6 Measurement Uncertainty .....................................................................................................................................9 2. Summary of Test Results ........................................................................................................................................... 10 3. Antenna Requirement ............................................................................................................................................... 11 3.1 Standard and Limit.............................................................................................................................................. 11 3.2 Test Result .......................................................................................................................................................... 11 4. Conducted Emissions ................................................................................................................................................ 12 4.1 Standard and Limit.............................................................................................................................................. 12 4.2 Test Procedure.................................................................................................................................................... 12 4.3 Test Data and Results .......................................................................................................................................... 13 5. Radiated Emissions ................................................................................................................................................... 16 5.1 Standard and Limit.............................................................................................................................................. 16 5.2 Test Procedure.................................................................................................................................................... 16 5.3 Test Data and Results .......................................................................................................................................... 18 6. Band-edge Emissions(Radiated) ............................................................................................................................... 22 6.1 Standard and Limit.............................................................................................................................................. 22 6.2 Test Procedure.................................................................................................................................................... 22 6.3 Test Data and Results .......................................................................................................................................... 22 7. Maximum Conducted Output Power ..........................................................................…

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Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report Annex C. Test Photos Conducted Emission Test View Radiated Emission Test View Below 1GHz Report No: DSP25100168-1E FCC ID: 2BSQE-GMC-500 Annex of Test Report Radiated Emission Test View Above 1GHz