The Power Probe 3 is a very powerful, compact, and useful diagnostic tool. I would recommended that any technician specializing in electrical diagnosis pick one of these test probes up. The Power Probe III is so easy to use; It could be used by a oil change guy, a general service tech, a master diagnostic tech, and even the back yard mechanic! This tool is easily one of the most useful in my toolbox. You wont regret getting one, I sure don't!
However, I do advise someone to use it with extreme caution. Always remember to check and comprehend all wiring diagrams associated with the circuit you are testing. If the circuit you are testing is directly connected to a computer component (such as ECM, PCM, EBCM, ect...) then it is possible that you could permanently damage that module. Seen it before so please head my warning. Most computer monitored circuits operate on 5 volts and supplying 12 volts to the circuit may fry the sensitive logic processor. The Power Probe 3 is also able to supply plenty of amperage on a 12 volt circuit before the thermal breaker buried deep inside the tool trips. Many people will warn you about the dangers of this tool as I have, but to a knowledgeable technician, it is a very powerful and handy tool. You have been warned.
"With the press of a switch you'll have an instant hot lead or ground lead. Use the probe tip and ground lead simultaneously to power up components right in your hand. Instantly check components for continuity as well as identify positive, negative and open circuits without re-polarizing hook-up clips. Look for shorts without wasting fuses. The 20ft lead will allow you to test bumper to bumper without jumper leads. Audio tone indicates positive with a high pitched tone and negative by a low pitched tone. The audio feature can be disabled when testing relays! The Power Probe III has 2 cool white LED’S that flood the work area with bright light. The housing is sleek and feels great in your hand." (Quoted from product description.)
You can use the Power Probe 3 to test fuses, relays, and to power up and/or ground components simultaneously. They sell other various kits to improve the functionality of the tester, such as the continuity checker, short detector, the screamer attachment, and extended lead and adapters set. I love to use the Power Probe 3 to diagnose power window issues, bad fuel pumps, alternators, cooling fans, and anything under the dash. The sharp needle end easily penetrates into a wire coating allowing for testing while only leaving a tiny hole that can be easily filled with brush on electrical tape. Just for the record, I never recommend proding a wire.
I have done quite a bit of research into finding the best price on the Power Probe IIl. I found the best deal to be on Amazon. That is where I got mine. If you buy them on a tool truck, you will pay approximately $199 on the Matco truck or around $175 on the Cornwell truck. It doesn't matter where you buy it from, its the same tool on the tool trucks as it is on Amazon so why not save a little bit of money? I would recommend getting one as soon as possible. It has more than paid for itself over the time I have had it. Power Probe III Ultimate 12 to 24 Volt Automotive Electrical Circuit Tester Kit
The Power Probe 3 also comes in several different colors and designs. There is a Exclusive Camo Edition as well as a Limited Carbon Fiber Edition available. Please don't forget to check out these articles below that I have written about how to understand electricity and use the power probe to test circuits.