---
product_id: 52874555
title: "Martindale CP501 Classic Check Plug 240V Socket Tester, Blue"
brand: "martindale"
price: "B/.93"
currency: PAB
in_stock: null
reviews_count: 8
category: "Martindale"
url: https://www.desertcart.com.pa/products/52874555-martindale-cp501-classic-check-plug-240v-socket-tester-blue
store_origin: PA
region: Panama
---

# 28 fault conditions detected 3 bright LEDs for instant fault ID Compact, tough ABS design Martindale CP501 Classic Check Plug 240V Socket Tester, Blue

**Brand:** martindale
**Price:** B/.93
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Plug in confidence, test with clarity!

## Quick Answers

- **What is this?** Martindale CP501 Classic Check Plug 240V Socket Tester, Blue by martindale
- **How much does it cost?** B/.93 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/52874555-martindale-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:** Sculpted ABS grip ensures easy removal and long-lasting use 🛠️
- • **Instant visual diagnostics:** Three bright LEDs provide clear, fail-safe fault codes 💡
- • **Zero hassle, zero batteries:** No batteries needed—always ready when you are
- • **Lightning-fast socket safety:** Detects 28 common wiring faults in seconds for peace of mind ⚡
- • **Trusted by pros & homeowners:** Over 2 million units sold—industry standard for reliable socket testing

## Overview

The Martindale CP501 Classic Check Plug is the UK’s top-selling 240V socket tester, trusted by electricians and homeowners alike. It quickly detects 28 wiring faults using three bright LEDs with clear fault codes, housed in a compact, durable ABS casing designed for easy grip and removal. Battery-free and fail-safe, it ensures your sockets are wired correctly and safely every time.

## 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: Brilliant plug - This is a great item. The previous one from a different company didn’t work
Review: A Classic Tester which works very well - Martindale testers have been around for decades, are simple to use and reliable. I quickly found out some of my sockets had live and neutral reversed - so much for professional installers!!

## 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 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 17,197 in DIY & Tools ( See Top 100 in DIY & Tools ) 16 in Circuit Testers |
| Colour | Blue |
| Customer Reviews | 4.7 4.7 out of 5 stars (700) |
| Date First Available | 29 May 2010 |
| Included components | 1 x Martindale Socket Tester |
| Item Package Quantity | 1 |
| Item Weight | 60 g |
| Item model number | CP501 |
| Manufacturer | Martindale Electric Co Ltd |
| Material | Abs |
| Measurement Accuracy | 50kohm |
| Measurement System | Metric |
| Number of Pieces | 1 |
| Part number | CP501 |
| Pattern | Three LEDs with fault codes |
| Power source type | Electric |
| Product Dimensions | 6.5 x 6.5 x 4.7 cm; 60 g |
| Style | Classic |

## Product Details

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

## Images

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

### ⭐⭐⭐⭐⭐ Brilliant plug
*by T***Y on 7 April 2025*

This is a great item. The previous one from a different company didn’t work

### ⭐⭐⭐⭐⭐ A Classic Tester which works very well
*by B***N on 3 February 2024*

Martindale testers have been around for decades, are simple to use and reliable. I quickly found out some of my sockets had live and neutral reversed - so much for professional installers!!

### ⭐⭐⭐⭐ 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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**Shop now:** [https://www.desertcart.com.pa/products/52874555-martindale-cp501-classic-check-plug-240v-socket-tester-blue](https://www.desertcart.com.pa/products/52874555-martindale-cp501-classic-check-plug-240v-socket-tester-blue)

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*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-02-28*