---
product_id: 112458852
title: "Mastercool 55900 Refrigerant Leak Detector, Blue"
brand: "mastercool"
price: "188632 Ft"
currency: HUF
in_stock: true
reviews_count: 6
category: "Mastercool"
url: https://www.desertcart.hu/products/112458852-mastercool-55900-refrigerant-leak-detector-blue
store_origin: HU
region: Hungary
---

# Certified to SAE J2791, J2913 & EN 14624 standards Heated tin oxide sensor for ultra-sensitive detection 15.5" flexible probe with intelligent tip for hard-to-reach leaks Mastercool 55900 Refrigerant Leak Detector, Blue

**Brand:** mastercool
**Price:** 188632 Ft
**Availability:** ✅ In Stock

## Summary

> 🔍 Detect leaks before they detect you — Mastercool 55900, the pro’s secret weapon!

## Quick Answers

- **What is this?** Mastercool 55900 Refrigerant Leak Detector, Blue by mastercool
- **How much does it cost?** 188632 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/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

- • **Ready for Action:** Comes complete with leak test vial, replacement filters, batteries, and rugged blow molded case for on-the-go pros
- • **Smart Probe Design:** Flexible 15.5" gooseneck with environment-sensing tip minimizes false alarms for reliable diagnostics
- • **Certified & Trusted:** Meets rigorous SAE and EN standards, ensuring professional-grade accuracy and compliance
- • **User-Centric Interface:** Multi-level LED indicators, volume control, and peak hold function keep you in control during complex leak hunts
- • **Pinpoint Precision Leak Detection:** Detects refrigerants down to 0.15 oz/year with lightning-fast response under 1 second

## Overview

The Mastercool 55900 Refrigerant Leak Detector features a heated tin oxide sensor capable of detecting all common refrigerants with exceptional sensitivity (down to 0.15 oz/year) and rapid response time (<1 second). Its 15.5" flexible probe with an intelligent environment-sensing tip reduces false alarms, while multi-level LED indicators and peak hold functionality enhance usability. Certified to SAE J2791, J2913, and EN 14624 standards, this professional-grade tool comes complete with essential accessories and offers up to 30 hours of battery life, making it a reliable choice for HVAC and automotive technicians seeking precision and efficiency.

## 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: Produto de excelente qualidade

## 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 |
| Batteries | 2 C batteries required. (included) |
| Best Sellers Rank | 795,387 in Automotive ( See Top 100 in Automotive ) 59,945 in Car Tools & Equipment |
| Brand | Mastercool |
| Customer Reviews | 4.2 4.2 out of 5 stars (149) |
| Date First Available | 6 Jan. 2015 |
| Item Weight | 454 g |
| Item model number | 55900 |
| Manufacturer | Mastercool |
| Manufacturer part number | 55900 |
| Model | 55900 |
| Product Dimensions | 26.42 x 6.1 x 39.37 cm; 453.59 g |

## Product Details

- **Alarm:** Visual
- **Brand:** Mastercool
- **Colour:** Blue
- **Global Trade Identification Number:** 00700376559002
- **Item weight:** 1 Pounds
- **Manufacturer:** Mastercool
- **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

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

### ⭐⭐⭐⭐⭐ Review
*by A***O on 24 July 2023*

Produto de excelente qualidade

### ⭐⭐⭐⭐⭐ Review
*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.

## 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 Hungary*
*Store origin: HU*
*Last updated: 2026-02-02*