---
product_id: 173632509
title: "Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100"
brand: "topdiag"
price: "€ 135.74"
currency: EUR
in_stock: true
reviews_count: 13
category: "Top Diag"
url: https://www.desertcart.hr/products/173632509-circuit-tester-automotive-power-circuit-probe-tester-circuit-breaker-finder
store_origin: HR
region: Croatia
---

# Supports 9V-70V input Built-in flashlight 40FT cable reach Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100

**Brand:** topdiag
**Price:** € 135.74
**Availability:** ✅ In Stock

## Summary

> ⚡ Power Up Your Auto Diagnostics with Confidence!

## Quick Answers

- **What is this?** Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100 by topdiag
- **How much does it cost?** € 135.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/173632509-circuit-tester-automotive-power-circuit-probe-tester-circuit-breaker-finder)

## Best For

- topdiag enthusiasts

## Why This Product

- Trusted topdiag brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Illuminate Your Diagnostics:** Integrated flashlight ensures no dark corner or late-night troubleshooting slows you down.
- • **Built-In Safety & Durability:** Overload protection with internal circuit breaker extends tool life and keeps you safe during intense diagnostics.
- • **Unmatched Reach for Every Job:** 40FT cable + 20FT extension lets you conquer wiring in trucks, trailers, and hard-to-reach spots with ease.
- • **4-in-1 Precision Testing Modes:** Switch effortlessly between DC Voltage, AC Voltage, Resistance, and Tone modes for comprehensive circuit analysis.
- • **Versatile Voltage Compatibility:** Works seamlessly with 12V cars and 24V trucks, plus supports a wide 9V-70V range for all your automotive needs.

## Overview

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.

## Description

Buy Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100: Industrial & Scientific - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: 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 desertcart. 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.
Review: Buena calidad - Excelente

## Features

- Same Function As PP3: This P100 Circuit Tester is an absolute must if you're trying to diagnose and electrical issues or think an electrical part is bad. Does everything the more expensive ones do and at a better price.
- Time Saver & Quick DIY Test: Don't know much about cars? The P100 Power Circuit Probe Tester allowed to track down the problem in minutes, much faster than regular multimeter to trace out the wiring.
- 20FT Extension Cable, Built-in Flashlight: Cable length is gonna be important when troubleshooting the rear of a truck! Topdiag electric tester comes with extra 20ft extension cable in addition to its own 20ft cable, allowing you to access any position of the vehicle and test it. Ideal for trailer wiring, it can be tested along the vehicle without having to find a suitable ground point. The built-in flashlight is convenient for detection, even in the dark or dim environment, it can provide the best view for who need to work in night.
- Car Circuit Tester Kit: This Topdiag automotive circuit breaker finder tool can activate components on/off-board electrical system/ equipment, is designed for car technician or car enthusiasts. By activating the signal generated by the component, you can accurately judged whether the component is intact, such as blower motor, power window motor, windshield wiper, rear window defroster, lights, radiator fans, fuel injectors, etc. Also, automotive circuit tester tool can activate component in your hand/ in the vehicle/ with ground etc.
- Tracking & Locating Short Circuits, Overload Protection: Topdiag Electrical Circuit Tracer has a built-in short circuit protection. If overloaded, its internal circuit breaker finder will trip to ensure the safety of users and prolong the service life of the tester. Circuit tester automotive with large battery clip, can carry more load. Support wide input voltage range from 9V to 70V, also support 12V cars and 24V trucks.
- 4 Working Modes: make circuit detection more simple. DC Voltage, AC Voltage, Resistance, Tone On/ Off. 1) DC Voltage mode can read DC voltage with 0.1V resolution. 2) AC Voltage can get Min & Max voltage, duty cycle and frequency quickly. 3) Resistance mode to read resistance between tip and auxiliary ground wire. 4) Unique Tone On/ Off Design is really useful when working in dim areas, it can judge the circuit voltage according to the volume of the sound.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Product Details

- **Brand:** TopDiag
- **Color:** Black
- **Item Weight:** 1.9 Pounds
- **Power Source:** Battery Powered
- **Style:** P100

## Images

![Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100 - Image 1](https://m.media-amazon.com/images/I/71ZNSnhZafL.jpg)
![Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100 - Image 2](https://m.media-amazon.com/images/I/71bsAMadXxL.jpg)
![Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100 - Image 3](https://m.media-amazon.com/images/I/71t9qdSYg8L.jpg)
![Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100 - Image 4](https://m.media-amazon.com/images/I/71yztPnao0L.jpg)
![Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100 - Image 5](https://m.media-amazon.com/images/I/81nqG82VjXL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Amazing tool for the price
*by C***C on June 9, 2024*

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.

### ⭐⭐⭐⭐⭐ Buena calidad
*by J***O on June 1, 2026*

Excelente

### ⭐⭐⭐⭐⭐ Tester
*by G***A on July 27, 2024*

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.

## Frequently Bought Together

- Circuit Tester Automotive, Power Circuit Probe Tester, Circuit Breaker Finder, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, Topdiag P100
- WINAMOO Automotive Test Light with 3-48V LED Digital Voltage Display, Auto Circuit Tester with Voltmeter & Dual Color Polarity Indicate, Electric Test Pen w/Stainless Probe for Car/Truck/SUV Checker
- JOREST 300Pcs Car Fuse Assortment Kit, 160 Mini Blade Fuses Automotive + 90 Standard Auto Fuses + 50 Micro Fuse + 1 Puller – for Car/RV/Truck/Motorcycle(2Amp 3A 5A 7.5A 10A 15A 20A 25A 30A 35A 40A)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-19*