2AI28-ET390RDigital Circuit Breaker Finder

INSTRUCTIONS INSTRUCCIONES INSTRUCTIONS ET390 ENGLISH PAGE 2 ESPAÑOL PÁGINA 9 FRANÇAIS PAGE 17 INSTRUCTIONS DIGITAL CIRCUIT BREAKER FINDERDIGITAL CIRCUIT BREAKER FINDER SPANISH TITLE FRENCH TITLE 1391063 REGULATORY DRAFT 05/26 ET390-1391063ART.indd 1ET390-1391063ART.indd 15/26/2026 10:43:37 AM5/26/2026 10:43:37 AM 3 - ENGLISH 2 - ENGLISH ENGLISH GENERAL SPECIFICATIONS • Operating Voltage: 85V to 135V AC, 50/60Hz • GFCI Operating Voltage: 102V to 132V AC, 50/60Hz • Operating Altitude: 6562' (2000m) • Relative Humidity: <90% non-condensing • Operating Temp: 32° to 122°F (0° to 50°C) • Storage Temp: -4° to 122°F (-20° to 50°C) • Dimensions (transmitter docked in receiver): 12" × 2" × 1.36" (305 × 51 × 35mm) • Weight (transmitter, receiver, and batteries): 7.2oz (204g) • Batteries: Transmitter: 2× AAA Alkaline (included) Receiver: 3× AAA Alkaline (included) • Auto-Power Off: Receiver: After 3 minutes of inactivity. Transmitter: After 3 minutes of inactivity, disabled when connected to live outlet • Standards: Conforms to UL STD 1436, 61010-1, 61010-2-30. Certified to CSA STD C22.2 # 160, 61010-1, 61010-2-30. • Drop Protection: 6.5' (2m) • Ingress Protection: IP40 dust resistant • Pollution Degree: 2 • FCC/IC ID: Transmitter: FCC ID: 2AI28-ET390T IC: 21655-ET390T Receiver: FCC ID: 2AI28-ET390R IC: 21655-ET390R Specifications subject to change. SYMBOLS ON BACK OF TESTER Risk of electric shock This product has been independently tested by Intertek and meets applicable published standards. Warning or Caution Read InstructionsWEEE – Battery disposal 5030000 14 9101112138 FEATURE DETAILS 1Transmitter LCDAGFCI IndicatorH" 6 Mode" Indicator 2Power ButtonBData Hold Indicator 3GFCI Test ButtonCBattery Status IndicatorIChannel ID 4Up ButtonDNumeric Values 5Down ButtonEHazardous Voltage Indicator 6Circuit Condition IndicatorsFWiring Condition Indicators 7Transmitter Battery CoverGLoRa Connectivity 8Receiver LCDLBattery Status Indicator 9Power/SEL ButtonMFault Indicator 10Up ButtonNLearn Mode Indicator 11Down ButtonOLocate Mode Indicator 12Sensing TipPLoRa Connectivity 13Circuit Condition IndicatorQ"6 Mode" Indicator 14Receiver Battery CoverRChannel ID JNumeric ValuesSMute Indicator KSignal Strength IndicatorT"CORR" (Correct) Indicator *Expected voltage reading on LCD based on the indicated wiring condition. NOTE: If the detected voltage is low (30–85V AC) or high (135–150V AC), the red indicator will illuminate. It is possible to have the red indicator (indicating low or high voltage) and the green indicator (indicating correct wiring) illuminated simultaneously. LCD WILL DISPLAYLEDVOLTAGE* "CORRECT""OPEN GRD""OPEN NEU""OPEN HOT""HOT/GRD REV""HOT/NEU REV""OPEN GRD NEU" GREENREDLINE VOLTAGENO VOLTAGE >30V VOLTAGE WIRING CONDITION WIRED CORRECTLY OPEN GROUND OPEN NEUTRAL OPEN HOT DUAL OPEN (NEUTRAL & GROUND) REVERSED HOT/GROUND REVERSED HOT/NEUTRAL Hot (Black) Neutral (White) Ground (Green) Not illuminatedIlluminated NOTE: No user-serviceable parts inside. 1 3 2 6 5 4 6 TRANSMITTER RECEIVER K P QRSL N T O M D BA H G C I E F J 7 ET390-1391063ART.indd 2-3ET390-1391063ART.indd 2-35/26/2026 10:43:37 AM5/26/2026 10:43:37 AM 5 - ENGLISH 4 - ENGLISH OPERATING INSTRUCTIONS USING RECEIVER FOR OUTLET DIAGNOSTICS 1. Pair the transmitter to the receiver (see PAIRING section). 2. The Circuit Condition Indicator (M) will display "CORRECT" or "FAULT" for wiring condition on the Receiver. Specific fault will display on the transmitter. 3. To perform a remote GFCI test, press and hold the Up and Down buttons on the receiver for 5 seconds. GFCI will trip on the transmitter, and the receiver will display the trip time and pretest voltage. After 10 seconds, the voltage will read "0V". WIRING CONDITION TEST Prior to use, always verify tester operation by testing on a known live and correctly wired electrical outlet. With the tester powered on and inserted into the outlet, the Hazardous Voltage Indicator (E) will appear, and one of the Circuit Condition Indicators will illuminate. If the "FAULT" (red) indicator illuminates, unplug the tester to read voltage (D) and wiring condition (F). The Data Hold Indicator (B) will illuminate and the transmitter will retain the information on the LCD for 10 seconds after removal from the outlet unless connected to another active circuit. If the tester indicates that the circuit is not wired correctly, consult a qualified electrician. NOTE: Conditions NOT indicated include, but are not limited to, quality of ground, multiple hot wires, reversal of neutral and ground conductors, and combinations of defects other than dual open neutral and ground. NOTE: All appliances or equipment on the circuit being tested should be unplugged to help reduce the possibility of erroneous readings. GFCI TEST NOTE: Prior to using this tester, refer to the GFCI device’s user manual for device-specific operational information. NOTE: All appliances or equipment on the circuit being tested should be unplugged to help reduce the possibility of erroneous readings. NOTE: NOT designed for testing 30mA ground-fault devices. Insert the transmitter into the electrical outlet. One of the Circuit Condition Indicators will illuminate. If the tester indicates that the outlet is not wired correctly, DO NOT attempt to test the GFCI device. Consult a qualified electrician. If the Circuit Condition Indicators indicate that the circuit is functioning properly, press the GFCI Test Button on the transmitter to test the GFCI device. The tester will create a 6mA to 9mA ground fault to trip the GFCI device. If successful, the LCD will toggle between the pre-test voltage and time to trip the breaker for 10 seconds. After 10 seconds, the tester will display OPEN GRD/NEUTRAL, and "> VAC" or "OPEN HOT" until the GFCI is reset. If the circuit remains energized, or if " > sec" appears on the LCD (1), the device being tested may be miswired, may not be installed correctly, or may not be functioning correctly. Consult a qualified electrician. …

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Form: RFT-AMER-TCB-OP-19n Revision: 1 Page 1 of 1 Date: 1/25/2023 Attention: Application Examiner Re: Covered List, located at https://www.fcc.gov/supplychain/coveredlist and 47 CFR parts §2.903 and §2.911(d)(5)(ii) of the FCC rules Applicant: Klein Tools Inc. FCC ID: 2AI28-ET390R To whom it may concern, Klein Tools Inc. (“Applicant”) certifies that the equipment for which authorization is sought is not “covered” equipment prohibited from receiving an equipment authorization pursuant to 47 CFR part §2.903 of the FCC rules and does not originate directly or indirectly from any company named on the covered list located in the link above or any subsidiary or affiliate thereof. Applicant further certifies that, as of the date of the filing of the application, the Applicant is not identified on the Covered List as an entity producing “covered” equipment and is not a subsidiary or affiliate of any such entity pursuant to 47 CFR part §1.50002 and required by 47 CFR part §2.911(d)(5)(ii) of the FCC rules. Applicant further certifies that no 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 is installed in the equipment being certified. I HEREBY CERTIFY THAT I am authorized to make the representations above on behalf of the Applicant and agree to immediately notify Intertek if there is any change in the status identified above. Russ Goldmann II Director Product Safety and Compliance Klein Tools Inc. April 20, 2026

Form: RFT-AMER-TCB-OP-19o Revision: 1 Page 1 of 1 Date: 1/25/2023 Attention: Application Examiner Re: Certification designating a U.S. agent for service of process pursuant to 47 CFR part §2.911(d)(7) of the FCC rules To whom it may concern, This letter is to certify that Klein Tools Inc. (“Applicant”) accepts responsibilities to act as its own agent pursuant to 47 CFR part §2.911(d)(7) of the FCC rules for service of process. I consent to the obligation to accept service of process on behalf of the applicant in regard to the FCC ID designated below. I HEREBY CERTIFY THAT I am authorized to make the representations above on behalf of the Applicant. I further acknowledge the requirement to maintain an agent extends for no less than one year after the termination of all marketing and importation or the conclusion of and commission-related proceeding involving the equipment and agree to immediately notify the FCC and Intertek if there is any change in the status identified above. Applicant Company Name : Klein Tools Inc. Contact Name : Russ Goldmann II Address : 450 Bond Street LINCOLNSHIRE IL 60069, USA Telephone No : +1-847-821-3305 Email : [email protected] FCC ID : 2AI28-ET390R Applicant FRN : 0025719949 Signature: ____________________________________ Date: April 20, 2026

2026/04/20 Federal Communications Commission 445 12 th Street SW Washington, DC 20554 Subject: Limited Agency Agreement Klein Tools Inc. FCC ID: 2AI28-ET390R To Whom It May Concern: We, Klein Tools Inc., hereby authorized Intertek Testing Services Shenzhen Ltd. Guangzhou Branch to act as our Agent for the purpose of preparing application for FCC ID number (2AI28- ET390R) under all applicable parts of the FCC rules and regulations. The effective date of this limited agency agreement is April 20, 2026. The Limited Agency Agreement expires on October 20, 2026, unless sooner terminated or extended by written notice to Intertek Testing Services Shenzhen Ltd. Guangzhou Branch and the Federal Communications Commission. This is to advise that we are in full compliance with the Anti-Drug Abuse Act. The applicant is not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 U.S.C. 862, and no party to the application is subject to a denial of federal benefits pursuant to that section. If you have any questions or comments, please do not hesitate to contact me. Sincerely, Printed Name: Russ Goldmann II Type Title: Director Product Safety and Compliance

1(1) 2026/04/20 Attention: Application Examiner RE: Request for Confidentiality Applicant: Klein Tools Inc. FCC ID: 2AI28-ET390R To Whom It May Concern: Permanent Confidentiality [Complete this section if permanent confidentiality is requested] Request is hereby submitted by Klein Tools Inc. to withhold permanently from public review certain portions of the application for equipment certification for the referenced FCC identifiers. This request for confidentiality is made pursuant to 47 CFR 0.457(d) and 0.459 of the FCC Rules. In particular, the following sections of the application are to be kept permanently confidential: [Select one or more of items below, as appropriate] • Schematics • Detailed Block Diagrams • Detailed Operational/Functional Description Rationale for request for confidentiality: Klein Tools Inc. has invested considerable time and materials in research and development to produce the referenced product. [Permanent confidentiality: Disclosure of the permanently confidential portions of this application to competitors would not only give them significant competitive advantages in developing similar products, but would also disclose successful implementation of unpublished, leading edge technology developed by us.] If you have questions or need further information, please contact the undersigned. Sincerely, Printed Name: Russ Goldmann II Type Title: Director Product Safety and Compliance Company name: Klein Tools Inc.

103.2 mm 1 1 . 2 m m 133.0 mm 1 1 . 2 m m 5001748 CA T II 135V GRAPHICS DRAWING NAME: ET390 Receiver Overlays Artwork ECO: TBD REVISION: 6 FINISHED GOOD DWGS. REF: ET390 PART DWGS. REF: XET390 COLORS REF: 1). 447C PANTONE DARK GRAY (BACKGROUND) 2). WHITE (PRINTING) 3). 165C PANTONE ORANGE (PRINTING) 4). CYAN (DIELINE REFERENCE - DO NOT PRINT)

Intertek Testing Services Shenzhen Ltd. Guangzhou Branch Room101/301/401/102/202/302/402/502/602/702/802, No. 7-2, Caipin Road, Huangpu District, Guangzhou, Guangdong, China Job No.: 260324134GZU FCC ID: 2AI28-ET390R RF Exposure Compliance Requirement Calculation formula： E (V/m) = (30*P*G) 0.5/d E = Electric Field (V/m) P = Peak RF output Power (W) G = EUT Antenna numeric gain (numeric) d = Separation distance between EUT and antenna (m) Remark: E(V/m)=10 X (dBUV/m) /20 ×10 -6 P=(E*d) 2 /30G in the formula above, d=3m, field strength= 97.8dBuV/m (max described by client), So P=1.82mW The worst case test separation distance is 5mm. The product belongs to standalone portable device base the FCC rule part 2.1091&2.1093. The transmission frequencies of the device are between 100 MHz and 6 GHz. In KDB 447498 D01 v06: 4.3.1 Standalone SAR test exclusion considerations: The SAR Test Exclusion Threshold is calculated from: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f(GHz)] ≤ 3.0 for 1-g SAR ⚫ f(GHz) is the RF channel transmit frequency in GHz ⚫ Power and distance are rounded to the nearest mW and mm before calculation 17 ⚫ The result is rounded to one decimal place for comparison The Max Conducted Output Power and SAR Test Exclusion Threshold (mW) are listed below: Transmit Frequency (MHz) Output power (mW) SAR Test Exclusion Threshold (mW) 915 1.82 15.68 According to SAR Exclusion Threshold in KDB 447498 (D01) General RF Exposure Guidance v06, the SAR report is not required. Test Location: Intertek Testing Services Shenzhen Ltd. Guangzhou Branch All tests were performed at: Room102/104, No 203, KeZhu Road, Science City, GETDD Guangzhou, China

Klein Tools Inc. TEST REPORT SCOPE OF WORK EMC TESTING–ET390 REPORT NUMBER 260324134GZU-001 ISSUE DATE [REVISED DATE] 17-June-2026 [---------------------] PAGES 28 DOCUMENT CONTROL NUMBER FCC Part 15.249 © 2017 INTERTEK TEST REPORT Room101/301/401/102/202/302/ 402/502/602/702/802, No. 7-2, Caipin Road, Huangpu District, Guangzhou, Guangdong, China Telephone: +86 20 8213 9688 Facsimile: +86 20 3205 7538 www.intertek.com.cn This report is for the exclusive use of Intertek's Client and is provided pursuant to the agreement between Intertek and its Client. Intertek's responsibility and liability are limited to the terms and conditions of the agreement. Intertek assumes no liability to any party, other than to the Client in accordance with the agreement, for any loss, expense or damage occasioned by the use of this report. Only the Client is authorized to permit copying or distribution of this report and then only in its entirety. Any use of the Intertek name or one of its marks for the sale or advertisement of the tested material, product or service must first be approved in writing by Intertek. The observations and test results in this report are relevant only to the sample tested. This report by itself does not imply that the material, product, or service is or has ever been under an Intertek certification program. Intertek Testing Services Shenzhen Ltd. Guangzhou Branch Room101/301/401/102/202/302/402/502/602/702/802, No. 7-2, Caipin Road, Huangpu District, Guangzhou, Guangdong, China Version: 03 December 2025 Page 2 of 28 FCC Part 15.249 Applicant Name & Address : Klein Tools Inc. 450 Bond Street LINCOLNSHIRE IL 60069, USA Manufacturing Site : Uni-Trend Technology (China) Co., Ltd No 6, Gong Ye Bei 1 st Road, Songshan Lake National High-Tech Industrial Development Zone, Dongguan City, Guangdong Province, China Intertek Report No: FCC ID: 260324134GZU-001 2AI28-ET390R Test standards 47 CFR PART 15 Subpart C: 2024 section 15.249 Sample Description Product : Digital Circuit Breaker Finder Model No. : ET390 Electrical Rating : 3x 1.5V LR03 AAA Serial No. : Not Labeled Date Received : 24 March 2026 Date Test Conducted : 29 April 2026-30 April 2026 Prepared and Checked By Richard Liu Engineer Approved By: Dean Liu Sr. Project Engineer TEST REPORT Intertek Report No.: 260324134GZU-001 Version: 03 December 2025 Page 3 of 28 FCC Part 15.249 CONTENT TEST REPORT ........................................................................................................................... 1 CONTENT ............................................................................................................................. 3 1.0 TEST RESULT SUMMARY ............................................................................................ 4 2.0 GENERAL DESCRIPTION ............................................................................................. 5 2.1 PRODUCT DESCRIPTION ........................................................................................................ 5 2.2 RELATED SUBMITTAL(S) GRANTS ........................................................................................... 5 2.3 TEST METHODOLOGY .......................................................................................................... 5 2.4 TEST FACILITY ..................................................................................................................... 5 3.0 SYSTEM TEST CONFIGURATION ................................................................................. 6 3.1 JUSTIFICATION .................................................................................................................... 6 3.2 EUT EXERCISING SOFTWARE ................................................................................................. 7 3.3 SPECIAL ACCESSORIES .......................................................................................................... 7 3.4 MEASUREMENT UNCERTAINTY .............................................................................................. 7 3.5 EQUIPMENT MODIFICATION ................................................................................................. 7 3.6 SUPPORT EQUIPMENT LIST AND DESCRIPTION .......................................................................... 8 4.1 ANTENNA REQUIREMENT ..................................................................................................... 9 4.2 OCCUPIED BANDWIDTH ..................................................................................................... 10 4.3 RADIATED EMISSION .......................................................................................................... 12 4.4 BAND EDGES REQUIREMENT ............................................................................................... 24 4.5 CONDUCTED EMISSIONS AT MAINS TERMINALS ..................................................................... 27 5.0 TEST EQUIPMENT LIST ............................................................................................. 28 TEST REPORT Intertek Report No.: 260324134GZU-001 Version: 03 December 2025 Page 4 of 28 FCC Part 15.249 1.0 TEST RESULT SUMMARY Test Item Test Requirement Test Method Result Antenna Requirement FCC PART 15 C Section 15.203 FCC PART 15 C Section 15.203 PASS Occupied Bandwidth FCC PART 15 C section 15.215(c) ANSI C63.10: Clause 6.9 PASS Radiated Emission FCC PART 15 C section 15.249 (a), (d) ANSI C63.10: Clause 6.4, 6.5, 6.6 PASS Band Edges Measurement FCC PART 15 C section 15.249 (d) ANSI C63.10: Clause 6.10 PASS Conducted Emissions at Mains Terminals FCC PART 15 C section 15.207 ANSI C63.10: Clause 6.2 N/A Remark: N/A: not applicable. Refer to the relative section for the details. EUT: In this whole report EUT means Equipment Under Test. Tx: In this whole report Tx (or tx) means Transmitter. Rx: In this whole report Rx (or rx) means Receiver. RF: In this whole report RF means Radio Frequency. ANSI C63.10: the detail version is ANS…

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Unit:mm

Note:EUT is positioned at the center of the turntable to keep 3 m between the measurement antenna and EUT for the radiated emissions measurements Radiated Radiated Emission (Below 30MHz) Radiated Emission (Below 1GHz) Radiated Emission (Above 1GHz)