EXTECH EX520 Heavy Duty True RMS Industrial MultiMeter



  • Double molded for waterproof (IP67) protection
  • Rugged design — drop proof to 6 feet
  • True RMS
  • 6000 count
  • Type K Temperature
  • Capacitance
  • 1000V input protection on all functions
  • Dual sensitivity frequency functions
  • Large backlit LCD with bargraph
  • Duty Cycle function
  • Diode open circuit voltage of 2.8V DC
  • Auto power off with disable feature
  • Min/Max/Relative/Data Hold
  • CE and EN61010 CAT IV-600V, CAT III-1000V
  • Complete with double molded test leads, magnetic hanging strap, Type K bead wire temperature probe, carrying case, and one 9V battery
  • Three year warranty

Authorised Australian distributor

CE   UL   IP67   CAT III   CAT IV   3 Years

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The EXTECH EX520 – Powerful and Rugged

The Extech EX520 was designed specifically for industrial, plant maintenance, MRO, electrical and other professionals like you who demand a meter as tough as you. The waterproof and drop-proof EXTECH EX520 Industrial MultiMeter delivers every multimeter function you need along with high accuracy and True RMS precision.

Features Overview

The EXTECH EX520 is designed to withstand harsh environments and usage, the meter’s rugged, double-molded housing is IP67-rated (waterproof and dustproof) and drop-tested to 6 feet. The large, illuminated LCD displays a 4-digit readout (to 6,000 counts). The EX520 offers various must-have measurements, including capacitance, frequency (dual sensitivity for electrical and electronic applications), diode and continuity functions. The meter features 0.09 percent accuracy and a CAT IV 600-volt safety rating, protecting users even on outdoor wiring.

True RMS Compensates for Distortion from Electronic Devices

The Extech is a True RMS DMM. It can be very difficult to make accurate current and voltage readings in industrial and commercial applications when electronic devices are present. Fluorescent lights, motor drives, computer power supplies, and other electronic systems can distort the AC waveform, making it hard for averaging meters to get an accurate read. True RMS uses a more advanced formula to adjust for this kind of distortion. Powered by a 9-volt battery, the EX520 has Auto Power Off (with disable) to conserve battery life.


As a waterproof tool, the EX520 is popular among marine technicians and boat mechanics who risk dropping the meter off a boat, pier or dock, into water. Since the meter is waterproof and floats, it’s easy to recover and is ready to resume working once retrieved.

Other Functions

Users also enjoy convenient, one-button access to frequently used functions: Min/Max, Average, Hold, and Relative Hold as well as selectable auto-ranging or manual-ranging. To avoid fussing with selecting the right measurement range when working on a variety of components from small electronics to main electrical sources, the meter automatically adjusts with auto-ranging. Besides electrical and electronic diagnostics, you can also take temperature measurements using the Type K bead wire probe included.

Display counts 6000
Basic Accuracy 0.09%
DC Voltage 0.1mV to 1000V
AC Voltage 1mV to 1000V
DC/AC Current 0.1ΩA to 20A
Resistance 0.1Ω to 60MΩ
Capacitance 0.01nF to 1000°F
Frequency (electrical) 0.01 to 400Hz
Frequency (electronic) 0.001Hz to 40MHz
Temperature (Type K) -50 to 1382°F
(-45 to 750°C)
Duty Cycle 0.1 to 99.9%
Diode Yes
Continuity Yes
Dimensions 7.25×3.25×2.25″
Weight 12.3oz
Weight 1 kg


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