Starting at $94.99

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  • AC/DC voltage range: 0.1mV to 1000V
  • AC/DC current range: 0.1µA to 10A
  • Resistance range: 0.1W to 40MW
  • Capacitance range: 0.01nF to 100µF
  • Frequency (electrical) range: 4Hz to 1kHz
  • Frequency (electronic) range: 0.001Hz to 10MHz
  • Basic accuracy: ±0.5%
  • Diode open circuit voltage of 2.8V DC
  • Relative/Data Hold
  • Double molded for waterproof protection (IP67)
  • Auto power off with disable feature
  • CAT IV-600V safety rating for industrial applications
  • Case and basic accessories included

The Extech EX503 is an industrial quality averaging multimeter featuring 1000V input protection over all ranges. The EX503 was designed to handle the rigors of field testing in adverse conditions including drop-tests from 6 feet as well as double molded housing for waterproof protection to IP67 standards. The EX503 also includes a CAT-IV-600V safety rating for industrial applications.

The Extech EX503 is a versatile instrument capable of accurately measuring AC/DC voltage, AC/DC current, resistance, capacitance and frequency. The basic accuracy of the meter is ±0.5%. Results are displayed on a large, 4000-count LCD.

Additional features of the Extech EX503 include: diode and continuity tests, Data Hold and Relative, an auto power off with disable feature, and dual sensitivity frequency functions (electrical/electronic).

Extech EX503 industrial multimeters ship complete with double molded test leads, magnetic hanging strap, carrying case, and 9V battery.


Extech TP200 Type K Pipe Clamp Temperature Probe
Hands-free temperature measurement from -4 to 200°F
Extech TP400 Type K Pipe Clamp Temperature Probe
Hands-free temperature measurement from -4 to 450°F

Test Leads

Extech TL803 Standard Test Leads
Standard replacement test leads, compatible with most multimeters
Extech TL805 Double Injected Test Leads
Professional grade, double coated PVC lead wires
Extech Alligator Clips
CAT III-1000V rated alligator clips
Extech TL808 Professional Test Lead Kit
8-piece professional test lead kit with CATIII-1000V safety rating
Extech TL809 Electronic Test Lead Kit
Ideally suited for testing digital circuitry
Extech TL810 Electrical Test Lead Kit
8-piece, versatile, CAT III-1000V rated testing kit
Extech TL708 Alligator Clips
Heavy duty, large alligator clips with toothed jaws
Extech TL726 Test Lead Set
Right angle and straight end flexible leads with shrouded banana plugs
Extech TL740 Test Clip Set
Industrial plunger style - spring loaded clip with steel jaws
Extech TL747 Test Probe Set
Sharp probes for use on high density components and boards and for piercing insulation
Extech TL748 Hook Tip Probes
Ideal for gripping a component lead or fine wire
Extech TL831 Test Lead Set
12 piece industrial grade test lead kit
In Stock
Extech TL833 Test Lead Set
Industrial test lead set with CAT III - 1000V rating
Extech TL841 Test Lead Kit
16-piece kit with multiple test lead tip configuration

Current Clamps

FLIR TA72 / TA74 Current Probes
Compatible with most brands of Multimeters and Clamp Meters, max AC current 3000A, ±3.0% accuracy
  • FREE Gift with FLIR purchases over $200


Please consider these optional accessories.

Extech Soft Vinyl Carrying Cases
Protect and store your multimeters and accessories in a soft vinyl carrying case
Extech HG500 Magnetic Hanging Strap
Magnetic hanging strap for the Extech EX500 Industrial Multimeters
Extech CA3000 Series Clamp-On Adapters
CAT IV 3000A AC Flex Clamp-on Adaptors, 10" or 18", AC current up to 3000A, 7.5mm cable diameter