EXTECH EX505 Heavy Duty True RMS Industrial MultiMeter


Extech EX505 TRMS Heavy Duty CAT IV Multimeter provides 1000V input protection on all functions. This heavy duty multimeter features dual sensitivity frequency functions.


  • True RMS DMM with 11 functions and 0.5% basic accuracy
  • AC/DC Voltage & Current, Resistance, Capacitance, Frequency, Temperature, Duty Cycle, Diode/Continuity
  • CAT IV-600V Safety Rating
  • Dual sensitivity frequency functions (electrical/electronic)
  • 1000V input protection on all functions
  • 10A max Current
  • Data hold, Relative, Auto power off
  • 4,000 count large backlit LCD
  • Double molded housing for waterproof protection
  • Complete with double molded test leads, magnetic hanging strap, Type K bead wire temp probe, carrying case and 9V battery

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CE   UL   IP67   CAT III   CAT IV   3 Years

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The EXTECH EX505 – Heavy Duty, Autoranging Digital Multimeter

The EXTECH EX505 11 Function Heavy Duty True RMS Industrial MultiMeter was designed specifically for industrial, plant maintenance, MRO, electrical and other professionals who need a heavy-duty, feature-rich multimeter.

Functional Overview

The EXTECH EX505 is a True RMS digital multimeter capable of taking numerous measurements, including capacitance, frequency (dual sensitivity for electrical and electronic applications), diode test and continuity. Other features include Data Hold and Relative Hold, and auto-ranging, which automatically adjusts the measurement range based on the detected source, such as electrical components and electronic equipment.

True RMS Capable

It can be very difficult to make accurate current and voltage readings in industrial and commercial environments where electronic devices are present. Fluorescent lights, motor drives, computer power supplies, and other electronic components can distort the AC waveform, making it hard for averaging meters to get an accurate reading. The EX505 uses a more advanced True RMS calculation to compensate for this kind of distortion.

Rugged & Versatile

Designed to withstand harsh environments and usage, the EX505’s rugged, double-molded housing is IP67-rated (waterproof and dustproof) as well as drop-tested to 6 feet. The large, illuminated LCD displays a 4-digit readout (to 4,000 counts). The meter features 0.5% accuracy and a CAT IV-600V safety rating, protecting users even on outdoor wiring.


As a waterproof tool, the EX505 has become a popular multimeter among marine technicians and boat mechanics who risk dropping the meter off a boat, pier or dock and into water. Since the meter is waterproof and floats, it’s easy to recover and is ready to resume work once retrieved. The EX505 features Auto Power Off (with disable) to conserve battery life, and the meter is backed by a three-year limited warranty.

Display Counts 4,000 count
Averaging/True RMS True RMS
Basic Accuracy 0.5%
DC/AC Voltage 0.1mV to 1000VDC
0.1mV to 1000VAC
DC/AC Current 0.1μA to 10A
Resistance 0.1Ωto 40MΩ
Capacitance 0.01nF to 100μF
Frequency (electrical) 5Hz to 1kHz
Frequency (electronic) 0.001Hz to 10 MHz
Temperature -20 to 750°C
Duty Cycle 0.1 to 99.9%
Diode/Continuity Yes
Dimensions 184 x 83 x 57mm
Weight 349g


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