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Yellow plastic probe with pointed metal tip and black grip

Lisle 24550 Computer Safe Circuit Tester

SKU CH-63JD-879MK

Computer-safe circuit tester protects sensitive automotive electronics during diagnostics

  • FeaturesTester, Battery Powered, false
  • Height2.7 L x 0.8 W x 5.9 H inches
  • Width2.7 L x 0.8 W x 5.9 H inches
  • Length2.7 L x 0.8 W x 5.9 H inches
  • Weight0.15 pounds
  • Sports Team1 Piece
  • Safe for vehicle computers — won’t damage sensitive electronics
  • Battery powered operation — no external power source needed
  • Compact 2.7 L x 0.8 W x 5.9 H inch size — fits tight spaces
  • Lightweight 0.15 pound design — easy to handle during tests
  • 115 years of manufacturing heritage — trusted Lisle quality

Computer-Safe Circuit Tester

The Lisle 24550 is a battery-powered electrical tester designed for automotive technicians and DIY mechanics. It checks circuits without risking damage to sensitive onboard computers or electronic control modules. The tool provides a safe method for diagnosing wiring faults in modern vehicles. Its compact 2.7 L x 0.8 W x 5.9 H inch form factor fits easily in a tool pouch.

Verify Vehicle Electrical System

Before use, confirm the vehicle battery is connected and the specific circuit under test is not carrying voltage beyond the tester’s intended range. Ensure the tester’s own battery is functional to power the indicator. The device is built for standard automotive low-voltage systems only. No external power source is required for operation.

Replaces Standard Test Lights

This tester upgrades from traditional incandescent test lights that can overload delicate electronics. The jump is worth it whenever probing circuits linked to ECUs, airbag modules or infotainment systems. It is not suited for high-voltage hybrid or EV battery pack diagnostics. Users needing non-contact voltage detection should choose a different instrument.

Highlights

  • Safe for vehicle computers — won’t damage sensitive electronics
  • Battery powered operation — no external power source needed
  • Compact 2.7 L x 0.8 W x 5.9 H inch size — fits tight spaces
  • Lightweight 0.15 pound design — easy to handle during tests
  • 115 years of manufacturing heritage — trusted Lisle quality

Specifications

BrandLisle
FeaturesTester, Battery Powered, false
Height2.7 L x 0.8 W x 5.9 H inches
Width2.7 L x 0.8 W x 5.9 H inches
Length2.7 L x 0.8 W x 5.9 H inches
Weight0.15 pounds
Sports Team1 Piece

Questions about this item

What comes with the Lisle 24550 and is anything else required to start testing?

The package contains one computer-safe circuit tester weighing 0.15 pounds; it is battery powered so no external power source or additional leads are needed.

There is only one size listed — how do I know this version suits my diagnostic needs?

The single 24550 model is designed for low-voltage automotive circuits and protects sensitive electronics, making it the appropriate choice for general computer-safe testing.

What does the computer-safe claim mean when I probe a live circuit in the vehicle?

The tester draws minimal current so it will not damage airbag modules, ECUs or other onboard electronics while indicating voltage presence.

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