--- product_id: 14520212 title: "55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial" brand: "mastercool" price: "€ 322.01" currency: EUR in_stock: true reviews_count: 9 category: "Mastercool" url: https://www.desertcart.hr/products/14520212-55900-intellasense-ii-refrigerant-leak-detector-heated-tin-oxide-sensor store_origin: HR region: Croatia --- # 6-Level LED Display 15.5" Flexible Probe Heated Tin Oxide Sensor 55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial **Brand:** mastercool **Price:** € 322.01 **Availability:** ✅ In Stock ## Summary > 🔍 Detect leaks before they detect you — stay ahead with Mastercool 55900! ## Quick Answers - **What is this?** 55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial by mastercool - **How much does it cost?** € 322.01 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/14520212-55900-intellasense-ii-refrigerant-leak-detector-heated-tin-oxide-sensor) ## 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 - • **User-Friendly LED & Controls:** Intuitive multi-color LED indicators and adjustable sensitivity levels for seamless operation. - • **Smart Probe, Zero False Alarms:** 15.5" flexible probe with environment-sensing tip minimizes false positives in complex settings. - • **Certified for Industry Standards:** Meets SAE J2791, J2913, and EN 14624 certifications—trusted by pros worldwide. - • **Peak Hold for Multi-Leak Mastery:** Locks highest leak signal while scanning continuously—never miss a critical detection. - • **Pinpoint Precision, Fast Response:** Detects leaks as small as 0.15 oz/year with <1 second response time for ultimate accuracy. ## Overview The Mastercool 55900 Intellasense II is a professional-grade refrigerant leak detector featuring a heated tin oxide sensor for ultra-sensitive detection of all common refrigerants including R134a and R1234yf. Certified to SAE and EN standards, it offers a 15.5" flexible probe with an intelligent tip to reduce false alarms, a peak hold function for multi-leak environments, and a user-friendly LED display. Compact and battery-powered, it delivers fast, reliable leak detection with up to 30 hours of battery life, making it an essential tool for HVAC and automotive professionals. ## 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: 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. Review: not bad still testing it - solid tool 3 stars for now have to use it more to make sure the quality is there will update ## 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 | | Alarm | Vibration | | Best Sellers Rank | #216,360 in Automotive ( See Top 100 in Automotive ) #123 in Fuel Leak Detectors #3,528 in Diagnostic, Test & Measurement Tools | | Brand | Mastercool | | Built-In Media | leak detector, molded case, 2C batteries, test vial replacement filters | | Color | Blue | | Customer Reviews | 3.9 out of 5 stars 51 Reviews | | Global Trade Identification Number | 00700376559002 | | Item Type Name | Refrigerant leak detector | | Item Weight | 16 ounces | | Manufacturer | Mastercool | | Manufacturer Warranty Description | 1 year | | Mfr Part Number | 55900 | | Model Number | 55900 | | Number of Items | 1 | | Power Source | Battery Powered | | Product Style | Intellasense II – Heated Tin Oxide Sensor | | Style | Intellasense II – Heated Tin Oxide Sensor | | UPC | 700376559002 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Mastercool - **Style:** Intellasense II – Heated Tin Oxide Sensor - **Power Source:** Battery Powered - **Color:** Blue - **Product Dimensions:** 30"D x 8"W x 6"H - **Item Weight:** 1 Pounds - **Alarm:** Vibration - **Global Trade Identification Number:** 00700376559002 - **Number of Items:** 1 - **Manufacturer:** Mastercool ## Images ![55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial - Image 1](https://m.media-amazon.com/images/I/51LbVxWwkeL.jpg) ![55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial - Image 2](https://m.media-amazon.com/images/I/81LD108VG9L.jpg) ![55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial - Image 3](https://m.media-amazon.com/images/I/81YR+vbpPzL.jpg) ![55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial - Image 4](https://m.media-amazon.com/images/I/71fWLwPIjlL.jpg) ![55900 Intellasense II Refrigerant Leak Detector – Heated Tin Oxide Sensor, Super Sensitive Mode, Certified for R134a and R1234yf, Compact Design with LED Display and Leak Vial - Image 5](https://m.media-amazon.com/images/I/81mzbLXK4vL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked beautifully on a very small & sneaky leak on my C6 Corvette when all else had failed. *by P***R on November 13, 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. ### ⭐⭐⭐ not bad still testing it *by A***R on August 15, 2025* solid tool 3 stars for now have to use it more to make sure the quality is there will update ### ⭐⭐⭐⭐⭐ Best investment *by A***C on February 27, 2025* Great product,does its job flawlessly ## Frequently Bought Together - Mastercool Refrigerant Leak Detector with Metal Oxide Gas Sensor, IntellaSense II, 55900, Blue - Mastercool 53123-YF Refillable R1234yf Oil/Dye Injector --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/14520212-55900-intellasense-ii-refrigerant-leak-detector-heated-tin-oxide-sensor](https://www.desertcart.hr/products/14520212-55900-intellasense-ii-refrigerant-leak-detector-heated-tin-oxide-sensor) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-21*