---
product_id: 112458852
title: "Mastercool 55900 Refrigerant Leak Detector, Blue"
brand: "mastercool"
price: "AED 1192"
currency: AED
in_stock: true
reviews_count: 6
category: "Mastercool"
url: https://www.desertcart.ae/products/112458852-mastercool-55900-refrigerant-leak-detector-blue
store_origin: AE
region: United Arab Emirates
---

# Multi-level LED Indicators - real-time diagnostic feedback Heated Tin Oxide Sensor - ultra-sensitive detection 15.5" Flexible Probe - reach hidden leaks easily Mastercool 55900 Refrigerant Leak Detector, Blue

**Brand:** mastercool
**Price:** AED 1192
**Availability:** ✅ In Stock

## Summary

> ❄️ Stay cool, catch leaks before they catch you!

## Quick Answers

- **What is this?** Mastercool 55900 Refrigerant Leak Detector, Blue by mastercool
- **How much does it cost?** AED 1192 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ae](https://www.desertcart.ae/products/112458852-mastercool-55900-refrigerant-leak-detector-blue)

## Best For

- mastercool enthusiasts

## Why This Product

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

## Key Features

- • **All-Inclusive Kit:** Comes with leak test vial, replacement filters, batteries, and durable blow molded case—ready for any job.
- • **User-Centric Design:** Ergonomic interface with volume control, sensitivity settings, and peak hold function for effortless operation.
- • **Smart Leak Detection:** Intelligent probe tip minimizes false alarms by adapting to environmental conditions.
- • **Certified Reliability:** Meets SAE J2791, J2913, and EN 14624 standards ensuring professional-grade accuracy and trust.
- • **Pinpoint Precision, Fast Response:** Detects refrigerant leaks as small as 0.15 oz/year in under 1 second for rapid troubleshooting.

## Overview

The Mastercool 55900 Refrigerant Leak Detector features a heated tin oxide sensor that detects all common refrigerants with exceptional sensitivity down to 0.15 oz/year. Certified to SAE and EN standards, it offers a 15.5" flexible probe with an intelligent tip to reduce false alarms, multi-level LED indicators for real-time diagnostics, and a user-friendly interface with peak hold and adjustable sensitivity. Packaged with essential accessories and backed by U.S.-based support, it’s the go-to tool for HVAC and automotive professionals who demand precision and reliability.

## Description

Overview The Mastercool 55900 Intellasense II is a compact, professional-grade leak detector designed to deliver reliable performance in real-world HVAC and automotive environments. Using an advanced heated tin oxide sensor, it detects refrigerant leaks down to 0.15 oz/year with exceptional speed and precision. Designed for R134a, R1234yf, and all common refrigerants, this tool is fully certified to SAE J2791, J2913, and EN 14624 standards. Key Features ✔️ ADVANCED SENSOR TECHNOLOGY – Heated tin oxide sensor detects refrigerants with high accuracy ✔️ PEAK FUNCTION – Highlights the highest leak detected for multi-leak environments ✔️ INTELLIGENT TIP DESIGN – Reduces false alarms by sensing and adjusting to the environment ✔️ MULTI-COLOR LED INDICATORS – Visual signal strength and diagnostic feedback in real-time ✔️ FLEXIBLE PROBE – 15.5" gooseneck reaches tight or hidden leak zones with ease ✔️ INTERTEK CERTIFIED – Complies with J2791 (R134a), J2913 (R1234yf), and EN 14624 standards Why Mastercool With over 35 years of innovation in A/C service equipment, Mastercool builds tools trusted by technicians worldwide. The 55900 combines accuracy, durability, and ease of use—offering dependable performance for serious leak detection needs. Technical Specifications - Sensor Type: Heated tin oxide - Sensor Life: 2000 hours - Sensitivity: High (0.15 oz/yr), Medium (0.25 oz/yr), Low (0.50 oz/yr) - Response Time: Less than 1 second - Probe: 15.5" flexible probe with intelligent tip - Display: 6-level LED indicator with diagnostics - Battery: 2 "C" alkaline batteries - Battery Life: 30 hours - Certifications: SAE J2791, J2913, EN 14624 - Includes: Detector, leak test vial, filters, 2 “C” batteries, blow molded case

Review: Five Stars - Like the equipment and is very sensitive.
Review: Worked beautifully on a very small & sneaky leak on my C6 Corvette when all else had failed. - This little guy solved a very frustrating issue I was having with my '07 C6 Corvette. For 3 years straight I would have to deal with a VERY slow refrigerant leak that would leave me with no AC each Spring when I would fire it up the first time after the long winter indoors. I changed so many parts and added dye, of course, but still no joy. I finally broke down and bought this tool when a local shop scared me with a big fat bid for digging into the issue. It turned out that there was a pin-hole in the condenser that could not be viewed by line of site with or without little mirrors and an IR light. I slipped this sneaky little sniffer-wand up in there and it started beeping like crazy. Bam! I installed the new condenser the next day and it has been hold perfectly with ice cold air at 45 degrees. My corvette is now colder than my wife... but in a good way :) I recommend this tool to anyone who wants to get to the leak quickly. It will pay for itself the first time you use it and if your friend's AC has an issue you might get to be someone's hero. Giddy-up.

## Features

- ✔️ HEATED TIN OXIDE SENSOR – Detects all refrigerants (CFCs, HCFCs, HFCs, and blends) with high sensitivity and fast response time
- ✔️ CERTIFIED PERFORMANCE – Complies with SAE J2791 (R134a), J2913 (R1234yf), and EN 14624 standards
- ✔️ SUPER SENSITIVE MODE – Enables enhanced detection of small leaks, including R1234yf and R407C
- ✔️ INTELLIGENT PROBE DESIGN – 15.5” flexible probe with environment-sensing tip minimizes false alarms
- ✔️ PEAK HOLD FUNCTION – Locks the highest leak signal while continuing to scan for additional leaks
- ✔️ USER-FRIENDLY INTERFACE – Volume/mute control, three sensitivity levels, and LED indicators for signal strength, sensor status, and diagnostics
- ✔️ INCLUDES ACCESSORIES – Comes in a blow molded case with leak test vial, replacement filters, and 2 “C” batteries
- ✔️ U.S. BASED CUSTOMER SUPPORT – Reliable service from Mastercool’s New Jersey headquarters

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00RVZ6WXQ |
| Best Sellers Rank | 36,102 in Automotive ( See Top 100 in Automotive ) 169 in Fuel System Tools 936 in Diagnostic, Testing & Measuring Tools |
| Brand | Mastercool |
| Customer Reviews | 3.9 out of 5 stars 52 Reviews |
| Global Trade Identification Number | 00700376559002 |
| Included Components | leak detector, molded case, 2C batteries, test vial replacement filters |
| Item Dimensions | 26.4 x 6.1 x 39.4 centimetres |
| Item Type Name | Refrigerant leak detector |
| Item Weight | 454 g |
| Item dimensions L x W x H | 26.4 x 6.1 x 39.4 centimetres |
| Item weight | 454 g |
| Manufacturer | Mastercool |
| Manufacturer Part Number | 55900 |
| Material | Tin Oxide |
| Model Number | 55900 |
| Product Warranty | 1 year |
| Smart Home Compatibility | Not Smart Home Compatible |
| Specific Uses For Product | refrigerant leak detection, HVAC, automotive |
| Specific uses for product | refrigerant leak detection, HVAC, automotive |
| Style | Intellasense II – Heated Tin Oxide Sensor |
| Style Name | Intellasense II – Heated Tin Oxide Sensor |
| UPC | 700376559002 |
| Unit Count | 1.0 count |

## Product Details

- **Alarm:** Visual
- **Brand:** Mastercool
- **Colour:** Blue
- **Global Trade Identification Number:** 00700376559002
- **Item weight:** 1 Pounds
- **Number of items:** 1
- **Power source:** Battery Powered
- **Product dimensions:** 76.2D x 20.3W x 15.2H centimetres
- **Style:** Intellasense II – Heated Tin Oxide Sensor
- **Unit count:** 1.0 count

## Images

![Mastercool 55900 Refrigerant Leak Detector, Blue - Image 1](https://m.media-amazon.com/images/I/51LbVxWwkeL.jpg)
![Mastercool 55900 Refrigerant Leak Detector, Blue - Image 2](https://m.media-amazon.com/images/I/81LD108VG9L.jpg)
![Mastercool 55900 Refrigerant Leak Detector, Blue - Image 3](https://m.media-amazon.com/images/I/81YR+vbpPzL.jpg)
![Mastercool 55900 Refrigerant Leak Detector, Blue - Image 4](https://m.media-amazon.com/images/I/71fWLwPIjlL.jpg)
![Mastercool 55900 Refrigerant Leak Detector, Blue - Image 5](https://m.media-amazon.com/images/I/81mzbLXK4vL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Five Stars
*by P***E on 9 November 2017*

Like the equipment and is very sensitive.

### ⭐⭐⭐⭐⭐ Worked beautifully on a very small & sneaky leak on my C6 Corvette when all else had failed.
*by P***R on 13 November 2025*

This little guy solved a very frustrating issue I was having with my '07 C6 Corvette. For 3 years straight I would have to deal with a VERY slow refrigerant leak that would leave me with no AC each Spring when I would fire it up the first time after the long winter indoors. I changed so many parts and added dye, of course, but still no joy. I finally broke down and bought this tool when a local shop scared me with a big fat bid for digging into the issue. It turned out that there was a pin-hole in the condenser that could not be viewed by line of site with or without little mirrors and an IR light. I slipped this sneaky little sniffer-wand up in there and it started beeping like crazy. Bam! I installed the new condenser the next day and it has been hold perfectly with ice cold air at 45 degrees. My corvette is now colder than my wife... but in a good way :) I recommend this tool to anyone who wants to get to the leak quickly. It will pay for itself the first time you use it and if your friend's AC has an issue you might get to be someone's hero. Giddy-up.

### ⭐⭐⭐⭐ Priced right
*by S***T on 7 June 2026*

Time will tell

## Frequently Bought Together

- Mastercool Refrigerant Leak Detector with Metal Oxide Gas Sensor, IntellaSense II, 55900, Blue
- Mastercool 53123-YF Refillable R1234yf Oil/Dye Injector

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*Product available on Desertcart United Arab Emirates*
*Store origin: AE*
*Last updated: 2026-08-05*