SKU: 76506941404

MASTERCOOL 55900 Blue Refrigerant Leak Detector

Sale price$165.36 Regular price$183.73
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17

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Description

MASTERCOOL 55900 Blue Refrigerant Leak DetectorAt the heart of this leak detector is a new low power metal oxide gas sensor with superior performance properties such as lower current consumption and sensor longevity. The new sensor is characterized by high sensitivity and fast response upon detecting the presence of extremely small levels of chlorofluorocarbon gases. For this reason, this sensor was selected and integrated into the 55900 Leak Detector. In addition, a powerful microprocessor was

At the heart of this leak detector is a new low power metal oxide gas sensor with superior performance properties such as lower current consumption and sensor longevity. The new sensor is characterized by high sensitivity and fast response upon detecting the presence of extremely small levels of chlorofluorocarbon gases. For this reason, this sensor was selected and integrated into the 55900 Leak Detector.
In addition, a powerful microprocessor was integrated into the design that automatically selects the best operating condition for the sensor to ensure optimum performance throughout the life of the sensor.
Super Sensitive Function allows the unit further sensitizing beyond the standard settings for locating small leaks with gases such as R1234yf and R407C

SENSITIVITY:
HIGH: 0.15 oz/yr (4 g/yr)
MEDIUM: 0.25 oz/yr (7 g/yr)
LOW: 0.50 oz/yr (14 g/yr)

PROBE:
Intelligent tip design that senses the condition of the environment, to eliminate the potential of false alarms.
Flexible 15.5" probe for difficult to reach locations

DISPLAY:
Six vertical LED's (red, yellow or green) display the following information to the user such as:
Relative signal level of the detected leak
Selected sensitivity range (low/medium or high) of the unit
Diagnostic information: low battery, interference/wait, contaminated atmosphere, readiness of the unit or fault conditions of the unit

REFRIGERANTS: Detects all refrigerants (CFC's, HCFC's, & HFC's and blends)
SENSOR LIFE: 2000 hours

SENSING ELEMENT: Heated tin oxide

OPERATING TEMPERATURE RANGE: 0 to 140°F

RESPONSE TIME: Less than 1 second
POWER: 2 C Alkaline 6000 mAh batteries

BATTERY LIFE: 30 hours

WEIGHT: 1.08 lbs

KEYPAD FUNCTIONS:
ON/OFF: Press the ON/OFF button to turn the unit on or off

VOLUME/MUTE: Press the VOLUME/MUTE button to control the volume of the unit

H M L SENSITIVITY: Press the H M L SENSITIVITY button to select the desired sensitivity level

PEAK/HR/LR: The PEAK/HR/LR key serves a dual purpose:
(1) To assist the user in locating the largest leak in a system with multiple leaks present.
(2) To enable the user to switch between HR (high range) and LR (low range) modes.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 76506941404

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Sonia V.
Charlottesville, US
★★★★★ 5
Costoso para el tamaño
Color: Pink
Muy buena calidad aunque muy caro para el tamaño
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Reviewed in the United States on February 5, 2026
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Cad
West Palm Beach, US
★★★★★ 3
Cost associated either app.
Color: Pink
Not easy instructions and didn’t know there would be a membership cost for app.
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karolina
Boise, US
★★★★★ 1
Average quality, not as premium as expected
Color: Beige
Before buying, I thought it would be a thick, glossy satin ribbon. After receiving it, I found the material is rather thin and the texture feels quite ordinary. When used for gift wrapping, it looks a bit cheap and doesn’t match the effect shown in the pictures.
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Reviewed in the United States on December 26, 2025
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albert berenberg
Waukegan, US
★★★★★ 1
Print quality is inconsistent
Color: Pink
Some labels come out okay, others look blurry or faded, especially with smaller fonts. For decorative ribbons, details matter, and this just isn’t reliable.
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Kimberley Cameron
Lake Worth, US
★★★★★ 1
Edges fray easily after cutting
Color: Beige
After cutting the ribbon, the edges tend to fray quite easily. This makes it less attractive when tying bows or using it for decoration, and it requires extra handling, which is not very convenient.
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Reviewed in the United States on December 26, 2025

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