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⚡ Power Up Your Auto Diagnostics with Confidence!
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, includes four versatile testing modes (DC/AC voltage, resistance, tone), and integrates a built-in flashlight for low-light conditions. Designed for quick, accurate troubleshooting with built-in overload protection, it’s the perfect blend of affordability and functionality for car enthusiasts and technicians alike.

























| ASIN | B07YC621J9 |
| Best Sellers Rank | #19,384 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Circuit Testers |
| Brand | TopDiag |
| Brand Name | TopDiag |
| Color | Black |
| Customer Reviews | 4.6 out of 5 stars 673 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 |
| 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
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.
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
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.
E**R
Great
I went with the 46.00 one and I love it. I've been using power probes for years and decided to give this one a try. It's way cheaper than a power probe and has more features. The only thing that would make it better is having a snap in probe instead of a screw in one but that's not even really an issue, just my preference
S**0
Excelente
Excelente herramienta muy muy buena
A**R
circuit tester
works good
G**E
12v tester
Works well and saved me a lot oftime
I**I
good product.
good for looking shorts or relays not working.
A**A
Recomienda ampliamente
Buena calidad de construcción, durable, fácil de manejar, preciso y con los accesorios incluidos la hacen una herramienta muy competitiva en el mercado
J**E
Saves me time
this has saved me so much time during troubleshooting circuit. fast shipping and i would recommend this product.
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.
Trustpilot
2 days ago
1 month ago