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Handheld automotive circuit probe tester with long cables and digital display

TopDiag P100 Power Circuit Probe Tester 12 24V 20 20FT Cable

SKU CH-8M5M-JRHA2

Tests 12 V and 24 V vehicle circuits for voltage, resistance, continuity and polarity with built-in breaker protection and 20 ft cables

  • Team affiliation1 Piece
  • Key featuresCorded Electric, false
  • Overall height9.84 L x 3.35 W x 7.48 H inches
  • Overall width9.84 L x 3.35 W x 7.48 H inches
  • Overall length9.84 L x 3.35 W x 7.48 H inches
  • Product typeMultimeters, Tach & Dwell Meters
  • Tests 12 to 24 V systems for broad vehicle coverage
  • Built-in circuit breaker protects tool and user from overloads
  • Activates components to verify continuity, ground and polarity
  • Measures AC/DC voltage, resistance and continuity in one probe
  • Includes 20 ft plus 20 ft cables for extended reach

Automotive Power Circuit Probe Tester

The TopDiag P100 is a versatile automotive electrical tool designed to test multiple parameters of a vehicle's electrical system. It measures AC/DC voltage, resistance, continuity, polarity, and connection status. Vehicle owners can diagnose electrical issues independently without professional assistance. The built-in circuit breaker protects both the tool and user against short circuits and overloads.

For DIY Vehicle Diagnostics

This probe tester suits car and truck owners who want to perform independent electrical system diagnosis on 12V and 24V systems. It covers multiple vehicle models and includes component activation functions for testing continuity, ground connections, short circuits, and polarity detection. Buyers who need wireless operation or battery-powered portability should look elsewhere, as this unit requires a corded electric connection.

70 Volt Maximum Measurement Range

The tester operates across a 0V to 70V range, which determines whether it matches the electrical systems you intend to probe. It comes with 20+20FT cable length for extended reach around the vehicle. The unit dimensions are 9.84 L x 3.35 W x 7.48 H inches. A quick self-test is recommended before each use to verify proper functioning.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $74.99
Pricier than about 90% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameTopDiag, Topdiag
Product typeMultimeters, Tach & Dwell Meters
Size & build
Overall height9.84 L x 3.35 W x 7.48 H inches
Overall width9.84 L x 3.35 W x 7.48 H inches
Overall length9.84 L x 3.35 W x 7.48 H inches
More details
Team affiliation1 Piece

Questions about this item

Will the built-in circuit breaker need replacement after it trips?

The breaker resets itself once the overload is cleared; no user-replaceable part is required.

What voltage ceiling stops the probe from reading higher?

Measurement range tops out at 70 V, so anything above that will not display.

Does the 20 ft cable get warm during continuous 24 V testing?

The cord carries only the probe signal current, so it stays at ambient temperature.

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