A studio product shot of the Klein Tools MM320KIT comprehensive electrical test kit. The kit includes the MM320 digital multimeter with test leads, the NCVT-3P dual-range non-contact voltage tester with integrated flashlight, the ET45 AC/DC voltage tester, the RT210 GFCI receptacle tester, batteries, and a heavy-duty padded black storage pouch.
Product infographic for the Klein Tools MM320 digital multimeter highlighting its key diagnostic functions. Text callouts detail its ability to measure 600V AC/DC voltage, 10A DC current, and 2M Ohms resistance, while technical icons confirm a 1-meter drop protection and a CAT III 600V safety rating.
A technical marketing graphic for the Klein Tools NCVT-3P dual-range voltage tester. The image highlights the tool's 12 to 1000V AC and 70 to 1000V AC sensitivity ranges, its "Tough Meter" design with IP67 waterproof rating, and a bright integrated flashlight that can be used independently of voltage detection.
Product infographic for the Klein Tools ET45 electronic voltage tester. The graphic specifies its capability to test AC voltages from 28V to 240V and DC voltages from 32V to 330V, featuring a built-in test lead holder designed specifically for testing US-style tamper-resistant outlets.
A product infographic for the RT210 GFCI outlet tester. Text callouts identify the tool's ability to detect the most common wiring problems in standard and GFCI receptacles and its integrated push-button used to confirm the operation of ground fault protective devices on 110/125V AC circuits.
An angled studio shot of the Klein Tools MM320 digital multimeter. The professional device features a high-visibility orange and black industrial housing, a 2000-count digital LCD screen, a multi-function rotary selector dial, and four safety-shrouded input ports for comprehensive electrical troubleshooting.
The back view of the MM320 digital multimeter showcasing its ergonomic field features. The image highlights the built-in kickstand for hands-free viewing on a workbench or jobsite, integrated test lead storage slots, and the battery compartment for two AAA batteries.
An angled studio shot of the ET45 AC/DC voltage tester highlighting its streamlined design. The device features integrated test leads with standard electrical probes and four distinct LED indicator levels (24, 48, 120, 240V AC and 32, 64, 160, 330V DC) for rapid circuit analysis.
Orange Klein-Tools voltage tester with digital display on a white background
A close-up view of the RT210 receptacle tester focusing on the 3-prong North American plug and the diagnostic faceplate. The tool features a high-contrast wiring fault legend and three LED indicator windows at the base for immediate visual confirmation of circuit status.
An action shot showing a technician using the NCVT-3P non-contact voltage tester to verify power at an industrial junction box. The integrated LED flashlight is activated to illuminate the wires, demonstrating the tool's effectiveness for safety inspections in dark or cramped workspaces.
A professional action shot of a technician using the Klein Tools MM320 digital multimeter to verify voltage at a standard residential electrical outlet. The multimeter's high-contrast LCD displays the reading while the technician, wearing protective gear, uses the precision test leads to ensure circuit safety.
A professional application shot of the RT210 GFCI receptacle tester plugged into a standard wall outlet. The device's bright LED indicators are illuminated to confirm a "Correct" wiring status, demonstrating the tool's ease of use for rapid electrical safety inspections in home and office environments.
Collection of electrical testing devices including multimeters and testers on a white background.
Test & Measurement 2015 promotional how to video
Dual-Range Non-Contact Voltage Testers (NCVT-2P and NCVT-3P) promotional how to video
A studio product shot of the Klein Tools MM320KIT comprehensive electrical test kit. The kit includes the MM320 digital multimeter with test leads, the NCVT-3P dual-range non-contact voltage tester with integrated flashlight, the ET45 AC/DC voltage tester, the RT210 GFCI receptacle tester, batteries, and a heavy-duty padded black storage pouch.
Product infographic for the Klein Tools MM320 digital multimeter highlighting its key diagnostic functions. Text callouts detail its ability to measure 600V AC/DC voltage, 10A DC current, and 2M Ohms resistance, while technical icons confirm a 1-meter drop protection and a CAT III 600V safety rating.
A technical marketing graphic for the Klein Tools NCVT-3P dual-range voltage tester. The image highlights the tool's 12 to 1000V AC and 70 to 1000V AC sensitivity ranges, its "Tough Meter" design with IP67 waterproof rating, and a bright integrated flashlight that can be used independently of voltage detection.
Product infographic for the Klein Tools ET45 electronic voltage tester. The graphic specifies its capability to test AC voltages from 28V to 240V and DC voltages from 32V to 330V, featuring a built-in test lead holder designed specifically for testing US-style tamper-resistant outlets.
A product infographic for the RT210 GFCI outlet tester. Text callouts identify the tool's ability to detect the most common wiring problems in standard and GFCI receptacles and its integrated push-button used to confirm the operation of ground fault protective devices on 110/125V AC circuits.
An angled studio shot of the Klein Tools MM320 digital multimeter. The professional device features a high-visibility orange and black industrial housing, a 2000-count digital LCD screen, a multi-function rotary selector dial, and four safety-shrouded input ports for comprehensive electrical troubleshooting.
The back view of the MM320 digital multimeter showcasing its ergonomic field features. The image highlights the built-in kickstand for hands-free viewing on a workbench or jobsite, integrated test lead storage slots, and the battery compartment for two AAA batteries.
An angled studio shot of the ET45 AC/DC voltage tester highlighting its streamlined design. The device features integrated test leads with standard electrical probes and four distinct LED indicator levels (24, 48, 120, 240V AC and 32, 64, 160, 330V DC) for rapid circuit analysis.
Orange Klein-Tools voltage tester with digital display on a white background
A close-up view of the RT210 receptacle tester focusing on the 3-prong North American plug and the diagnostic faceplate. The tool features a high-contrast wiring fault legend and three LED indicator windows at the base for immediate visual confirmation of circuit status.
An action shot showing a technician using the NCVT-3P non-contact voltage tester to verify power at an industrial junction box. The integrated LED flashlight is activated to illuminate the wires, demonstrating the tool's effectiveness for safety inspections in dark or cramped workspaces.
A professional action shot of a technician using the Klein Tools MM320 digital multimeter to verify voltage at a standard residential electrical outlet. The multimeter's high-contrast LCD displays the reading while the technician, wearing protective gear, uses the precision test leads to ensure circuit safety.
A professional application shot of the RT210 GFCI receptacle tester plugged into a standard wall outlet. The device's bright LED indicators are illuminated to confirm a "Correct" wiring status, demonstrating the tool's ease of use for rapid electrical safety inspections in home and office environments.
Collection of electrical testing devices including multimeters and testers on a white background.
Test & Measurement 2015 promotional how to video
Dual-Range Non-Contact Voltage Testers (NCVT-2P and NCVT-3P) promotional how to video
KLEIN TOOLS

Klein Tools MM320KIT Digital Multimeter Electrical Test Kit with Dual Range Non-Contact Voltage Tester Flashlight ET45 Receptacle RT210 GFCI Analyzer

Only 2 left
SKU: MM320KIT
$59.99

Description

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The Ultimate Troubleshooting Powerhouse: Klein Tools MM320KIT Comprehensive Electrical Diagnostic Kit

The Klein Tools MM320KIT is an all-in-one professional diagnostic solution designed for electricians, maintenance technicians, and serious DIYers who demand accuracy and safety. This elite kit centers around the MM320 Digital Multimeter, a rugged tool capable of measuring up to 600V AC/DC and 10A DC current. Whether you are troubleshooting household appliances, automotive circuits, or industrial panels, the MM320 provides the reliable 2000-count resolution needed to verify resistance, continuity, and diode health. By bundling four essential testers into a single high-value package, Klein Tools ensures you have the right instrument for every phase of electrical verification, from initial detection to final certification.

Beyond the multimeter, this kit includes specialized tools for rapid field testing. The NCVT-3P Dual-Range Non-Contact Voltage Tester features an integrated flashlight and a high-sensitivity mode for low-voltage systems (12V) and standard mains (up to 1000V). For quick outlet checks, the ET45 provides instant AC/DC voltage level indicators, while the RT210 GFCI Receptacle Tester identifies five common wiring faults—including open ground and reverse polarity—ensuring every outlet in your project is safely energized. Housed in a durable padded carrying case, this kit is built to survive the jobsite with 3.3-foot drop protection and CAT III 600V safety ratings, making it the definitive choice for comprehensive electrical system maintenance.

Key Features

  • Versatile MM320 Multimeter: Measures up to 600V AC/DC voltage and 10A DC current with 2MΩ resistance sensing.
  • Dual-Range NCVT-3P: Safely detects 12V to 1000V AC with an integrated high-intensity flashlight for dark workspaces.
  • Four-Level ET45 Tester: Rapidly indicates AC voltages (28V–240V) and DC voltages (32V–330V) without a digital display.
  • RT210 Receptacle Analyzer: Instantly diagnoses wiring conditions in standard and GFCI outlets with clear LED indicators.
  • GFCI Safety Testing: Dedicated push-button on the RT210 verifies the operation of ground fault protective devices.
  • Rugged Protection: All components are engineered for durability, featuring drop protection and a professional padded storage case.

What's Included

  • (1) MM320 Digital Multimeter
  • (1) NCVT-3P Dual-Range Non-Contact Voltage Tester with Flashlight
  • (1) ET45 AC/DC Voltage Tester
  • (1) RT210 GFCI Receptacle Tester
  • (1) Set of Right-Angle Test Leads
  • (1) Padded Carrying Case
  • (1) Set of Batteries for All Devices

Specifications

Maximum Voltage 600V AC/DC (Multimeter) / 1000V AC (NCV)
Current Range 10A DC
Resistance (Ohms) 2MΩ
Safety Rating CAT III 600V
Display Type 2000 Count LCD (MM320)
Drop Protection 3.3 ft (1 m)
NCVT Sensitivity 12–1000V AC and 70–1000V AC
Special Functions Battery Test, Diode Test, Continuity, Data Hold
MM320 Length 6.39 in (16.2 cm)
MM320 Width 3.12 in (7.9 cm)
MM320 Height 1.8 in (4.6 cm)
Weight 8.2 oz (232 g)

Pro-Tip: Before testing an outlet for power, always use the RT210 Receptacle Tester to verify the wiring configuration. Even if an outlet has power, an "Open Ground" condition can prevent surge protectors and sensitive electronics from functioning safely. Always verify your testers on a known live circuit before and after each use to ensure your safety.