

🔧 Power up your diagnostics — be the fleet hero everyone trusts!
The Topdiag P150 is a professional-grade automotive electrical tester designed for 6V-30V systems. It features intelligent AC/DC voltage detection, short circuit location, component activation, and a 20ft cable for versatile vehicle diagnostics. With built-in circuit breaker protection and multilingual support, it’s the ultimate tool for fast, safe, and precise troubleshooting across cars, trucks, motorcycles, and more.











| ASIN | B0D4QTR483 |
| Best Sellers Rank | #9,648 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #17 in Circuit Testers |
| Brand Name | TopDiag |
| Color | Black |
| Customer Reviews | 4.6 out of 5 stars 1,791 Reviews |
| Included Components | 1 P150 Probe Tester |
| Item Weight | 0.8 Kilograms |
| Manufacturer | TopDiag |
| Measurement Type | Multimeter |
| Minimum Operating Voltage | 6 Volts |
| Model | P150 |
| Power Source | Corded Electric |
| Specification Met | Ce, Fc, Rohs |
| Style Name | P150 |
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.
B**G
Works great and very cheap
Works great as a power probe! Wire length is very long. Easy to use hook up ground and test or send 12 volts to what you’re needing to test.
B**T
Definitely faster and improves your diagnostic capabilities
Good quality works well highly recommend I use it for diagnosing issues in electrical problems on my vehicle vehicles
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.
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
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.
T**E
Gets the job don. But, wire is not long enough.
Affordable test light. Be aware that the wire is not long enough to test any electronics inside vehicles if you are connected to the under the hood battery. You will definitely need an adapter for any serious diagnostics.
A**A
Fast shipping
Very cool Item
Trustpilot
5 days ago
1 month ago