General Technologies Corp GTC CT8002 Cordless Circuit Tester, Black

u cant see the red light ? u will hear the beep , u cant hear the beep you will feel the vibration . i bought my first one about 3-4 year ago ( without vibration ) , and i forget it in customer car so i bought 3 more and received it today just an amazing product , i test ECM without worry about damage the ecu highly recommended and ill bought more now :D

Very Hard to Find This Brand, But worth it

Best cordless tester ever had

good tool to have. I like the fact you act as a ground.

Very easy to use and does what it states.

Just lik a normal test light that beeps. I suspect it uses your body for a ground connection. It is so weird and cool at the same time . You just poke poke beep beep instantly. Wireless amazing.

Although it is vaguely buried in the description, I dont think it is clear that this unit ONLY detects positive (+) DC current. If you work on pre-World War II antique cars this unit will not identify a live circuit on positive ground systems. The tech support folks at GTC were very helpful in identifying this limitation. It works fine on modern cars and other low voltage negative ground systems. Unfortunately, it is useless for my applications.

After using one of these testers you will throw your old corded one away nice bright red light and beep lets you see and hear to see if there is power to the circuit you are testing without worrying about you ground wire falling off when you are upside under a dash or trying to get a good ground simply hold the tester and touch any metal part of what you are working on with any part of your body that has skin exposed forearm,elbow other hand etc many time you are already touching some thing that has a ground battery last forever this is my second one first one lasted me 3 years of hard use many falls and the battery was still good

Great product, well built and functions the same

works well for quick check for power. simple to use and small enough to fit in you pocket while working.