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Yellow handled circuit tester with 49 inch cord and spring strain relief

Lisle 28400 Heavy Duty Circuit Tester 12V 49" Cord

SKU CH-7C7R-8X2QK

Tests 12 V circuits with a 49" cord and reinforced probe for durability

  • Team affiliation1 Piece
  • Key featuresCircuit tester, Corded Electric, false
  • Overall height10.5 L x 4.25 W x 1.25 H inches
  • Overall width10.5 L x 4.25 W x 1.25 H inches
  • Overall length10.5 L x 4.25 W x 1.25 H inches
  • Product weight0.3 lb (0.14 kg)
  • Tests low voltage circuits up to 12 volts
  • Reinforced probe handle cord and clamp for durability
  • 49 inch cord with strain relief spring
  • Lightweight at .3 pounds for easy handling
  • 115 years of manufacturing experience since 1903

Heavy Duty Circuit Tester 12V

The Lisle 28400 is a 12 volt circuit tester built for automotive electrical diagnostics. A 49 inch cord with a strain relief spring connects the reinforced probe and handle to a heavy duty clamp. The tool weighs 0.3 pounds and measures 10.5 by 4.25 by 1.25 inches.

Upgrading From Basic Probes

This tester replaces fragile low voltage probes that lack reinforced cords or strain relief. The jump is worth it when daily shop use demands a probe handle and clamp that resist repeated bending and pulling. The 49 inch reach also eliminates the need for extension leads on most vehicle looms.

For Professional Technicians

The reinforced construction suits technicians who test low voltage circuits every day and need a tool that survives drops and cable stress. Buyers who require high voltage measurement or digital readouts should look at a different instrument.

How it compares

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

Price $23.99
Cheaper than about 67% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameLisle, LISLE
Product typeVoltmeter
Size & build
Overall height10.5 L x 4.25 W x 1.25 H inches
Overall width10.5 L x 4.25 W x 1.25 H inches
Overall length10.5 L x 4.25 W x 1.25 H inches
Product weight0.3 lb (0.14 kg)
More details
Team affiliation1 Piece

Questions about this item

What clearance does the 10.5-inch long tester need in a tight engine bay?

The probe assembly measures 10.5 L x 4.25 W x 1.25 H inches, so allow at least that footprint plus room for the 49-inch cord to route without binding.

How do you connect the tester so the ground clamp stays secure while probing?

Clip the reinforced alligator clamp to a clean chassis ground, then use the strain-relief spring near the handle to keep the 49-inch cord from pulling the clamp loose during testing.

Which part wears out first and can be replaced on the 28400 tester?

The probe tip takes the most contact wear; it is user-replaceable, while the reinforced cord, clamp and handle are built for the tool's full service life.

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