---
product_id: 52874555
title: "CP501 Classic Check Plug 240V Socket Tester, Blue"
brand: "martindale"
price: "€ 44.50"
currency: EUR
in_stock: true
reviews_count: 8
category: "Martindale"
url: https://www.desertcart.at/products/52874555-cp501-classic-check-plug-240v-socket-tester-blue
store_origin: AT
region: Austria
---

# 240V max operating voltage Detects 28 wiring fault conditions 3 bright LEDs for instant fault codes CP501 Classic Check Plug 240V Socket Tester, Blue

**Brand:** martindale
**Price:** € 44.50
**Availability:** ✅ In Stock

## Summary

> 🔌 Stay Wired Right: The Classic Socket Tester Every Pro Swears By!

## Quick Answers

- **What is this?** CP501 Classic Check Plug 240V Socket Tester, Blue by martindale
- **How much does it cost?** € 44.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/52874555-cp501-classic-check-plug-240v-socket-tester-blue)

## Best For

- martindale enthusiasts

## Why This Product

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

## Key Features

- • **Ergonomic & Durable:** Compact, sculpted ABS design offers a secure grip and easy removal from sockets.
- • **Trusted by Millions:** Over 2 million units sold, the UK’s go-to socket tester for electricians and homeowners alike.
- • **Instant Fault Detection:** Three bright LEDs provide clear, fail-safe wiring fault codes for quick diagnosis.
- • **Low Leakage, High Safety:** Induces less than 5mA earth leakage, well below RCD trip thresholds for peace of mind.
- • **Comprehensive Safety Check:** Detects 28 common wiring faults ensuring your sockets meet safety compliance every time.

## Overview

The Martindale CP501 Classic Check Plug is a compact, robust 240V socket tester featuring three bright LEDs that instantly identify 28 common wiring faults. Trusted by over 2 million users, it ensures quick, reliable safety checks with a sculpted grip design for easy handling and minimal earth leakage, making it essential for electricians and homeowners seeking fast, fail-safe socket verification.

## Description

From the manufacturer Martindale CP501 Classic Check Plug 240V Socket Tester Sold in over 2 million units, the Martindale CP501 is the most popular socket tester available. The classic check plug is a quick and easy way to ensure that 13A sockets are correctly wired, indicated by 3 bright long life LEDs. Wiring faults are indicated by one or more of the LEDs failing to illuminate, with the pattern of lit LEDs indicating the type of fault detected. This fail-safe system means that any LED not lit indicates a fault. The robust ABS housing has a sculpted shape for easy removal and there is a look up chart on the tester for quick fault diagnosis. The plug induces less than 5mA of earth leakage, well below RCD trip thresholds. Quick & easy testing of socket wiring with the UK’s favourite check plug Detects 28 fault conditions Three bright LEDs with clear & simple fault codes on the plug Tough sculpted design for easy removal CAT II 300V - Built for safety Quick & easy testing of mains socket wiring Three bright LEDs with simple fault codes

Review: Good product. Recommend. - Bought a few of these now.
Review: Simple and Reliable Socket Safety Checker - The CP501 Classic Check socket tester is a handy tool for quickly checking the safety of your 240V sockets. It’s very straightforward to use—just plug it in and the indicator lights clearly show whether the wiring is correct or if there’s a fault. This makes it ideal for both DIY users and anyone wanting extra peace of mind at home. The compact design is easy to carry around, so you can test multiple sockets without hassle. The light indicators are bright and easy to understand once you’ve checked the guide. It feels solid enough for regular use and doesn’t require any setup or batteries. It’s especially useful for identifying common wiring issues quickly, though it’s more of a basic diagnostic tool rather than a full electrical tester. Overall, a simple, effective, and affordable device for checking socket safety.

## Features

- Quick and easy testing of 240V UK sockets to ensure correct wiring and safety compliance
- Detects 28 common wiring fault conditions for reliable electrical safety checks
- Three bright LEDs with clear fault codes for instant and accurate identification
- Compact and tough design with sculpted grip for easy removal from sockets
- Ideal for electricians and homeowners for fast socket verification before use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003OHDFSA |
| Best Sellers Rank | 55,958 in DIY & Tools ( See Top 100 in DIY & Tools ) 55 in Circuit Testers |
| Brand | Martindale |
| Colour | Blue |
| Customer Reviews | 4.7 out of 5 stars 703 Reviews |
| Global Trade Identification Number | 05036162183003 |
| Included Components | 1 x Martindale Socket Tester |
| Item Dimensions | 6.5 x 6.5 x 4.7 centimetres |
| Item Type Name | Socket Tester |
| Item Weight | 0.06 Kilograms |
| Item dimensions L x W x H | 6.5 x 6.5 x 4.7 centimetres |
| Item weight | 0.06 Kilograms |
| Manufacturer | Martindale Electric Co Ltd |
| Manufacturer Part Number | CP501 |
| Maximum Operating Voltage | 240 Volts |
| Measurement Type | Electrical |
| Minimum Operating Voltage | 240 Volts |
| Model Number | CP501 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Electric |
| Power source | Electric |
| Product Warranty | 2 year |
| Style | Classic |
| Style Name | Classic |
| Unit Count | 1.0 count |

## Product Details

- **Brand:** Martindale
- **Colour:** Blue
- **Item weight:** 0.06 Kilograms
- **Power source:** Electric
- **Style:** Classic

## Images

![CP501 Classic Check Plug 240V Socket Tester, Blue - Image 1](https://m.media-amazon.com/images/I/61JnqbmHWCL.jpg)
![CP501 Classic Check Plug 240V Socket Tester, Blue - Image 2](https://m.media-amazon.com/images/I/51tQKwpyKWL.jpg)
![CP501 Classic Check Plug 240V Socket Tester, Blue - Image 3](https://m.media-amazon.com/images/I/511QconXEkL.jpg)
![CP501 Classic Check Plug 240V Socket Tester, Blue - Image 4](https://m.media-amazon.com/images/I/51UAe55+YEL.jpg)
![CP501 Classic Check Plug 240V Socket Tester, Blue - Image 5](https://m.media-amazon.com/images/I/51aQCDwBLrL.jpg)

## Questions & Answers

**Q: Will this show up a socket that has power fluctuations?**
A: The Martindale CP501 Socket Tester is primarily designed to identify wiring faults and will not reliably show power fluctuations.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good product. Recommend.
*by M***N on 2 March 2026*

Bought a few of these now.

### ⭐⭐⭐⭐⭐ Simple and Reliable Socket Safety Checker
*by J***N on 3 May 2026*

The CP501 Classic Check socket tester is a handy tool for quickly checking the safety of your 240V sockets. It’s very straightforward to use—just plug it in and the indicator lights clearly show whether the wiring is correct or if there’s a fault. This makes it ideal for both DIY users and anyone wanting extra peace of mind at home. The compact design is easy to carry around, so you can test multiple sockets without hassle. The light indicators are bright and easy to understand once you’ve checked the guide. It feels solid enough for regular use and doesn’t require any setup or batteries. It’s especially useful for identifying common wiring issues quickly, though it’s more of a basic diagnostic tool rather than a full electrical tester. Overall, a simple, effective, and affordable device for checking socket safety.

### ⭐⭐⭐⭐ Recommend
*by B***3 on 15 January 2026*

Great value, packaged well. Does the job.

## Frequently Bought Together

- Martindale CP501 Classic Check Plug 240V Socket Tester, Blue
- Martindale VT12 Two Pole Voltage and Continuity Tester, Yellow
- Martindale Electric NC4 Dual Sensitivity Voltage Tester, Volt Stick with Torch, Circuit Tester

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-10-10*