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The Topdiag P150 is a professional-grade automotive electrical tester designed for 6V-30V vehicles. It offers 18+ diagnostic functions including AC/DC voltage detection, fuel injector testing, short circuit location, and component activation. Equipped with a 20ft cable and dual LED lights, it ensures extended reach and visibility in any workspace. Safety is prioritized with built-in circuit breaker protection and no internal battery. Compatible with a wide range of vehicles and supporting multiple languages, the P150 streamlines electrical troubleshooting for professionals and enthusiasts alike.

















| ASIN | B0D4QTR483 |
| Best Sellers Rank | #13,200 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Circuit Testers |
| Brand Name | TopDiag |
| Bullet Point | Electrical Tester: Topdiag P150 is a power circuit probe tester for all 6v-30v vehicles, with 18+ professional services, it is able to perform AC/DC voltage detection, intelligent test, fuel injector inspection, resistance test, component activation, short circuit located, jump lead function, frequency, test trailer lights, bad ground checking, and polarity test, etc., Fuel Injector Test & Compone… |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,892) |
| Included Components | 1 P150 Probe Tester |
| Item Weight | 0.8 Kilograms |
| List Price | 89.99 |
| Manufacturer | TopDiag |
| Measurement Type | Multimeter |
| Minimum Operating Voltage | 6 Volts |
| Model | P150 |
| Package Weight | 1.18 Kilograms |
| Part Number | P150 |
| Power Source | Corded Electric |
| Size | P150 |
| Specification Met | Ce, Fc, Rohs |
| Style Name | P150 |
| Title | Electrical Tester for 6V-30V Cars, Short Circuit Breaker Finder Tool, Automotive Circuit Tester, Voltage Tester, P150 |
A**R
Works great
Very easy to read and use. Great for testing circuits and loads
E**D
Fast Diagnostic Tool
First Impression - Easy to use. The bright color is easy to find in my toolbox. This tool streamlines electrical troubleshooting on the fleet I maintain. This works on tractors, trucks, trailers and agricultural implements. Any 12-24v DC system I take it to. On mine the tip will heat up until it glows when you power something, so be careful how long you hold the power button. I use it momentarily with no problems. The beeps and buzzers are impossible to ignore because they are bright and loud. That makes this tool safer IMO. There is no internal battery, which makes it even safer, and simple to maintain. The wires are long enough to reach the tail lights on almost anything. I really like it. It's intuitive, fast, brightly colored, and makes me look like I know what I'm doing even when I really don't.
J**E
Great for DIY fixing vehicles
I'm more new to automotive electric so this tool definitely was perfect for me. I was able to read the instructions and diagnose my cars wiring problem in no time. The light on it is very bright so that helped me in dark cramped spaces. It functions perfect for the price.
W**.
Great for the price.
Had issues. Seller made it right. Power probe is great. Checks ohms and send power and ground. Leads are long and work great. No problems with product after seller helped me.
A**R
Must have for mechanics
Great tester has everything I needed very high quality and a great value a must have for mechanics
E**I
Absolute must-have tool for DIY mechanics and troubleshooting
This 12-volt power probe is a must-have for any do-it-yourself mechanic. I’m still discovering everything it can do, but it has already become one of the most useful tools I own. It’s been especially handy at the junkyard—hook it straight to a battery and you can power electric seats, windows, and locks without tearing anything apart. Being able to test circuits directly makes diagnosing electrical issues much faster. I’ve used it to find shorts, identify broken wires, and quickly power components like locks, radios, and windows to confirm they work. It saves a ton of time compared to traditional test lights or chasing wiring blindly. The tool feels solid, works exactly as advertised, and is incredibly convenient for both troubleshooting and testing. For the price, you really can’t beat it. This is one of those tools you don’t realize you need until you have it—and then you won’t want to work without it. Highly recommended.
C**T
Power probe
Should of bought one sooner. Best tool to have for diagnosing electrical issues. Easy to use. The wire length is a little short for the grounding probe but it has not been an issue so far
J**E
It works perfectly I recommend getting one
This is a must have it will help you a lot I use it to check if solenoids are still good before going out to buy a new one
G**E
Works well and saved me a lot oftime
J**R
Great tool for fault finding on vehicle electrics.
I**I
good for looking shorts or relays not working.
M**R
Muy buen producto cumple con su trabajo
G**.
Tiene defectos de fabricación
Trustpilot
1 month ago
1 month ago