Circuit Testers | McMaster-Carr

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Measures

Equivalent Series Resistance

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Retractable Insulation Piercing Grabber

Threaded Needle Tip

Threaded Needle Tip with Alligator Clip

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30V AC to 122,000V AC

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GFCI Receptacle Tester

High-Resolution Circuit Tracer

Receptacle Tester

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For Fluke Model Number

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Test Leads with Needle Tips

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DC Voltage

Measurement Unit

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Batteries Required

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Banana Connection Style

Current

AC Current

Connection End Shape

226 Products

Measuring and Inspecting

Electrical Outlet Testers

Confirm proper wiring by checking for open circuits

2 products

Line Break Detectors

Check for continuity in circuits

7 products

Voltage Detectors

Check for voltage in receptacles, cables, and electrical components

13 products

Circuit Breaker Identifiers

Determine which circuit breaker is connected to an electrical receptacle

4 products

Circuit Tracers

Locate cables behind walls, check for continuity, and identify circuit breakers

2 products

Current Detectors

Check for AC current and voltage without making direct contact with wire

1 product

Test Leads

Pair with electrical testers such as multimeters to analyze your devices

41 products

Test Lead Tips

Adapt Fluke test leads to perform electrical tests in tight spaces

1 product

Data Cable Identifiers

Trace unshielded data and telephone cables to their source

1 product

Multimeters

Take current, voltage, resistance, and other electrical measurements

109 products

Electronic-Component Testers

Test, identify, and troubleshoot components such as circuit boards and diodes

4 products

Patch Cords

Make point-to-point connections between electrical testing equipment and your devices

12 products

Decade Boxes

Test and troubleshoot circuits without needing to solder capacitors or replace resistors

3 products

Electrical

Binding Posts

Test circuits before making permanent connections

14 products

Extension Cord Circuit Interrupter Converters

Hardwire to extension cords to protect against electric shock in wet areas

9 products

Relays

Electrically open and close circuits to control power to lights, motors, and other equipment

5 products