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🔧 Power up your diagnostics with the P100 — the ultimate circuit tester for pros who refuse to be slowed down.
The TopDiag P100 Automotive Circuit Tester is a professional-grade diagnostic tool featuring a massive 40-foot cable plus 20-foot extension for unparalleled reach. It supports 12V and 24V systems with a broad 9V-70V input range, and offers four essential testing modes: DC voltage, AC voltage, resistance, and tone detection. Equipped with a built-in flashlight and overload protection, this lightweight yet durable tester is designed for quick, accurate troubleshooting of automotive electrical circuits, making it an indispensable tool for car technicians and enthusiasts alike.

























| ASIN | B07YC621J9 |
| Best Sellers Rank | #19,522 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #33 in Circuit Testers |
| Brand | TopDiag |
| Brand Name | TopDiag |
| Color | Black |
| Compatible Devices | Vehicles (12V cars, 24V trucks, trailers) and their electrical components |
| Customer Reviews | 4.6 out of 5 stars 656 Reviews |
| Included Components | 1*P100 |
| Item Dimensions | 6 x 2.4 x 1.2 inches |
| Item Weight | 1.9 pounds |
| Item dimensions L x W x H | 6 x 2.4 x 1.2 inches |
| Manufacturer | Topdiag |
| Measurement Type | Ammeter, Multimeter, Ohmmeter, Voltmeter |
| Minimum Operating Voltage | 9 volts_of_direct_current |
| Model | P100 |
| Number of Items | 1 |
| Part Number | TopDiag |
| Power Source | Battery Powered |
| Style | P100 |
| Style Name | P100 |
| UPC | 791276754598 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 110 °C |
C**C
Amazing tool for the price
First let me be clear, if you make a living using this kind of tool, get a Snap-on or Matco or something that comes with the big huge warranty and is built beefy, but for me, I only use kind of tool every so often and for that it is perfect. First, it comes with a 40 foot cable. That is amazing! I love that part and is what initially sold me on it. When doing trailer and RV wiring I can power it by the batteries in front and I have 40 feet to mess around with. I could not find another tool with this length in this price range on Amazon. This was the best. As for functions, it has all the basic functions you need and a couple of advanced ones but it is not as advanced as some of the really good automotive ones or the Flukes but again, at this price, what do you expect. That vast majority of the work you'll be doing will be done just using the normal functions so this fits the bill perfectly. Overall this is a great buy and I have used it quite a bit across hundreds and hundreds of feet of wire and I have not had an issues with it. It is accurate, and always works so I can test the circuits.
J**O
Buena calidad
Excelente
A**R
circuit tester
works good
D**Z
very good
does exactly what it says it does. very good at it. i would say it’s even better than a normal power probe III since is has very similar functions to the probe IIIEZ. i gave it four stars instead of five because you have to screw the actual probe into the thingy. the original power probe is a female banana and male banana which means you can just plug it in every time you want to use it. you can use a old power probe to convert this one which is what i did but it would be a 20/10 if they sold the piece to convert it or made ir a banana in stock form like the autel power probe. if you only plan on using it to read voltage and to give voltage you could probably buy the cheaper version of this and be alright
G**A
Tester
The products is of awesome quality, performance,lengthy cords and a real good price.Use this in a fuse box to testing fuses and was able to find 3 fuses bad in my vehicle and just that save me money because I fixed the problem myself and save money from having to take it to the a mechanic shop.This product is very easy to use and if you are not sure just look on u tube for a quick video on how use this product.
S**0
Excelente
Excelente herramienta muy muy buena
M**.
Easy to use
Easy to use for sure. I'm not a mechanic but after reading the instructions i was able to a lot of electrical trouble shooting on my 96 Ram.
U**N
Updated review
Crapped out on me after the 8 yimes of use. Kinda disappointed. Update to a previous bad review. The company reached out & made things right. Which, tbh is hard to come by. The new one works great, i will keep this review up to date. So far ive used it about 6 times, working great so far. Really not bad for the price & customer support that comes with it.
G**E
12v tester
Works well and saved me a lot oftime
I**I
good product.
good for looking shorts or relays not working.
C**E
Excelente precio.
Me parece de excelente calidad, solo al verlo, se ven buenos materiales y muy completo. Espero y me sea de mucha utilidad en la reparación.
M**R
Excelente herramienta facilita el trabajo
Muy buen producto cumple con su trabajo
J**E
Saves me time
this has saved me so much time during troubleshooting circuit. fast shipping and i would recommend this product.
Trustpilot
4 days ago
3 weeks ago