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The Topdiag P100 is a professional-grade automotive power circuit probe tester designed for 12V and 24V systems. Featuring a built-in circuit breaker for safety, dual 20ft cables for extended reach, and multi-function testing capabilities including AC/DC voltage, resistance, continuity, and polarity, it empowers vehicle owners and technicians to quickly diagnose electrical issues with precision. Backed by a 1-year warranty and 24/7 tech support, it’s the ultimate tool for efficient, reliable automotive electrical troubleshooting.













| ASIN | B0BZD7PGZR |
| Best Sellers Rank | #71,076 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #116 in Circuit Testers |
| Brand | TopDiag |
| Brand Name | TopDiag |
| Color | Black |
| Compatible Devices | Vehicles with 12V or 24V electrical systems |
| Customer Reviews | 4.6 out of 5 stars 909 Reviews |
| Item Dimensions | 9.84 x 3.35 x 7.48 inches |
| Item dimensions L x W x H | 9.84 x 3.35 x 7.48 inches |
| Manufacturer | Topdiag |
| Measurement Type | Multimeter |
| Min. Operating Voltage | 12 Volts |
| Minimum Operating Voltage | 12 Volts |
| Model | Topdiag P100 |
| Part Number | Topdiag P100 |
| Power Source | Corded Electric |
| Style | P100 |
| Style Name | P100 |
| UPC | 753955453710 |
| Unit Count | 1.00 Count |
| Upper Temperature Rating | 50 Degrees Celsius |
A**A
Worked exactly as I hoped and then some. Fixed a Diagnosis I was chasing for days!
Absolutely cannot recommend this tool enough. It works exactly as I hoped and has loads of features. Wasn't too hard to figure out. Plenty of cable length so no fear of it being annoying to use. The ground cable is a little short so make sure you've got some testing probes and wires for adjustments. Was chasing a No fuel pump No start condition that was hiding for days. Eventually found the culprit hidden in the Fuel pump assembly that holds the fuel pump together and allows the chassis harness to plug into it. Had a hidden arc damage in the connector on the assembly. This tool ruled it out by simulating power to the pumps making sure they were good but also fully testing the assembly to see if it worked. Solved the mystery and saved me a major headache. Would highly recommend this as it made my life so much easier. Yes it did come with a case too! The P150 model Fuel Pump testing worked flawless and was able to monitor Voltage as well.
D**E
This Probe has a scope too!
I was totally shocked and surprised that this Probe had a little "Lab Scope". Using A/C Voltage screen, I got the 'Scope' and Frequency and Duty cycle. It was able to 'see' my ignition coil primary firing! I would not be making a lab scope diagnosis from here, but, this is great for that first 15 minute view into 'What is going on here'? I am looking forward to proving it can 'See' things like Purge valve duty cycle, along with blower motors, fans etc! The other Probe features appear to be very good and normal. Positive and negative tip, circuit breaker, logic probe indicator, continuity, tone, Ohms, etc. Remember,TRIGGER CONTROL! Don't put power or ground to any computer circuit. Those are the really small wires. If you do, you will surely burn up the computer,.... you know....'Let the smoke out'! It is safest to disconnect the particular load from the circuit before trying to power it up and see if it runs, ie: UNPLUG IT! Happy Trails ,
D**N
Great deal
Great customer service. I had one burn out, had a new one the next day. This machine has helped me save customers a lot of money. I can diagnose sensors and find shorts, test Fuses and wiring with precision. I was even able to simulate voltage for the temp sensor to verify cooling fans worked properly. Very nice setup. I also tried testing injectors. It does work but its a little more involved.
E**.
Bought 2, one great! One so so
Works great, does exactly what it says it does. BUT I bought 2 one for home and one for work. They both came in different lengths and one came with a Velcro strap. About a year later one of the buttons is a little sticky but still works
B**N
Great
Great for the price
K**1
Helpful tool!
Helped diagnose starter issue old vs new starter, new starter found defective thanks to this tool. Very accurate! Pretty easy to use.
M**N
Probe
Great tool with out spending a lot of money in the original brand highly recommended
S**A
future
full disclosure, i received this a few days ago and i havent used it yet. but i had been looking at the power probe but finding it hard to justify the price. i saw this on sale for less than 1/3 the price of the power probe, but hesitated on it, becuase i didnt know if it had the same features. one in particular, when testing for +12 and gnd, the power probe will only give a "go" signal if the voltage is within 0.8v of supply. this is handy as it wont give a "false positive" on a high resistance connection. i read through all of the comment sand questions and could not find anyone mentioning weather or not this model had that feature, so, before i bought i downloaded the manual, and it stated that is DOES share this feature, so, i bought one. looks to be of sufficient quality to perform the needed tasks, so as it stands im content with saving a substantial chunk of change.
P**B
Good
Good kit, with many features
I**.
Útil
muy buena opción y alternativa a power probe aprovechen el precio! saludos desde guanajuato México
D**S
Muy bueno y rápido me llego pero no es lo que viene el conector de 40ft es mentira
Muy bueno y rápido llego antes de la fecha pero el cable es muy corto no son 40ft y aparteel conector es fijo no se desconecta
C**S
Bueno
El producto es bueno pero solo lean bien las especificaciones decía q venía el cable largo y el estuche pero no fue así por eso lo devolví
Trustpilot
1 week ago
1 month ago