---
product_id: 173632509
title: "Circuit Tester Automotive, Power Circuit Probe Tester, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, P100"
brand: "topdiag"
price: "$183"
currency: NZD
in_stock: true
reviews_count: 8
category: "Top Diag"
url: https://www.desertcart.nz/products/173632509-circuit-tester-automotive-power-circuit-probe-tester-test-light-automotive
store_origin: NZ
region: New Zealand
---

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

**Brand:** topdiag
**Price:** $183
**Availability:** ✅ In Stock

## Summary

> 🔧 Power up your diagnostics — test smarter, not harder!

## Quick Answers

- **What is this?** Circuit Tester Automotive, Power Circuit Probe Tester, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, P100 by topdiag
- **How much does it cost?** $183 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/173632509-circuit-tester-automotive-power-circuit-probe-tester-test-light-automotive)

## 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

- • **Safety-First Design:** Built-in short circuit and overload protection keeps you and your vehicle safe while extending tool longevity.
- • **Illuminate & Diagnose:** Integrated flashlight ensures you never miss a detail, even in dim garages or nighttime troubleshooting.
- • **Unmatched Reach & Access:** 40FT total cable length with extension lets you test anywhere on your vehicle, no more awkward stretching or guesswork.
- • **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 9-70V range for all your diagnostic needs.

## Overview

The TopDiag P100 Automotive Circuit Tester is a professional-grade diagnostic tool featuring a 40-foot cable with extension, built-in flashlight, and four versatile testing modes (DC/AC voltage, resistance, tone). Compatible with 12V and 24V systems and supporting a broad 9-70V input range, it offers quick, safe, and precise electrical troubleshooting for cars and trucks. Its overload protection and rugged design make it an essential tool for DIY mechanics and automotive pros alike.

## Description

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

Review: 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.
Review: 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

## 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 | #9,188 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #16 in Circuit Testers |
| Brand | TopDiag |
| Brand Name | TopDiag |
| Color | Black |
| Customer Reviews | 4.6 out of 5 stars 1,843 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 (DC) |
| Model | P100 |
| Power Source | Battery Powered |
| Style | P100 |
| Style Name | P100 |
| UPC | 791276754598 |
| Upper Temperature Rating | 110 Degrees Celsius |

## Product Details

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

## Images

![Circuit Tester Automotive, Power Circuit Probe Tester, Test Light Automotive with 40FT Cable, Car Fuse Tester, AC DC 12V 24V Car Diagnostic Tool, P100 - Image 1](https://m.media-amazon.com/images/I/71gVTomuHLL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Absolute must-have tool for DIY mechanics and troubleshooting
*by E***I on January 5, 2026*

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.

### ⭐⭐⭐⭐⭐ Definitely faster and improves your diagnostic capabilities
*by B***T on December 26, 2025*

Good quality works well highly recommend I use it for diagnosing issues in electrical problems on my vehicle vehicles

### ⭐⭐⭐⭐⭐ Must have for mechanics
*by A***R on February 6, 2026*

Great tester has everything I needed very high quality and a great value a must have for mechanics

## 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 New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-19*