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 Electrical Test Kit MM320KIT Digital Multimeter (600V AC DC Dual Range Volt Pen Flashlight ET45 Receptacle RT210 GFCI Circuit Diagnostics)

Only 1 left
SKU: MM320KIT
$59.99 USD

Description

Klein promotional logo logout

Verify System Potential and Isolate Receptacle Wiring Faults Instantly with an Elite Multi Instrument Circuit Diagnostic Assembly

The Klein Tools MM320KIT is a professional 4-piece electrical verification set featuring the MM320 digital manual-ranging multimeter, NCVT-3P dual-range non-contact volt pen, ET45 level indicator, and RT210 GFCI socket analyzer. The primary multi-tester monitors infrastructure networks up to 600V AC/DC and 10A DC paths, generating clear 2000-count digital resolution matrices across system resistance and diode tracks. Operating alongside this diagnostic hardware, the accompanying non-contact tracing pen scans low-potential 12V controls up to 1000V AC mains using an independent flashlight module to streamline terminal sweeps inside unlit connection panels.

Best Used For:

  • Commercial Socket Analysis: Plugging the three-prong diagnostic checker directly into standard wall receptacles to reveal open grounds or inverted polarity lines.
  • Low Voltage Control Sweeps: Lowering tracing pen thresholds to 12V AC to isolate tracking faults in thermostats, entry bells, and irrigation system arrays.
  • Automotive Loop Interrogations: Using the 10A DC multimeter connection path to audit auxiliary fuse blocks and locate current drainage points safely.

Key Performance & Safety Features

  • Quad-Tester Diagnostics: Bundles a 2000-count digital multi-tester, a non-contact sensing pen, a tier indicator, and a ground-fault interrupter circuit analyzer.
  • Dual Sensitivity Volt Pen: Alternates cleanly between low-threshold 12V and standard 70V to 1000V AC bands to cross-examine separate building grids.
  • Battery Free Level Tracking: Companion pocket tester uses passive internal circuit power to map standalone indicators up to 240V AC and 330V DC lines.
  • Simultaneous Interrupter Safety Audits: Analyzer panel mounts a dedicated simulation test switch to trip and certify structural ground-fault hardware mechanisms.
  • Padded Storage Enclosure: Includes a heavy-duty fabric zipper pouch with specialized interior divisions to isolate individual diagnostic tools from field impact abrasion.
  • Industrial Protection Index: All core hardware bodies feature a ruggedized build profile rated to survive structural concrete tool drops up to 3.3 feet.

What's Included

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

Technical Specifications

Maximum Potential Scope (MM320): 600V AC / 600V DC
Maximum Non-Contact Detection: 1000V AC
Direct Current Scale Bounds: 10A DC
Maximum Circuit Resistance: 2MΩ
Industrial Safety Certification: CAT III 600V
Display Interface Profile: 2000 Count LCD (MM320 Component)
Chassis Drop Protection: 3.3 ft. (1 m)
NCVT Proximity Sensitivity: 12 - 1000V AC / 70 - 1000V AC
Special System Diagnostics: Battery Test, Diode Test, Continuity, Data Hold
Multimeter Unit Length: 6.39 in.
Multimeter Unit Width: 3.12 in.
Multimeter Unit Height: 1.8 in.
Multimeter Net Tool Weight: 8.2 oz.
Pro-Tip: When diagnosing power anomalies on appliance boards, cross-verify the lead continuity chime with a detailed resistance track reading; resistance measurements creeping above zero indicate carbon tracks forming on the substrate layers.