SKU: 76506941404

MASTERCOOL 55900 Blue Refrigerant Leak Detector

Sale price$165.36 Regular price$183.73
Save 10%

Pay in installments of $45.93 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 2 - Aug 7

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

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

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.6 ★★★★★
Based on 14 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
M
Verified Purchase
Mar Gee
Grantham, US
★★★★★ 5
Style and comfort
Size: Medium, Color: Black
Exactly what I was looking for. Style and sock thickness and comfort.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 14, 2025
A
Verified Purchase
Amazon Customer
Fort Morgan, US
★★★★★ 5
Comfortable
Size: Medium, Color: Blue
So comfortable! They stay up perfectly love love love
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 7, 2025
A
Verified Purchase
Andrew B
Charlottesville, US
★★★★★ 5
High Quality
Number of Items: 6, Color: Black (6-pairs), Size: Large
High quality and fit great
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
P
Verified Purchase
Peter
Carnegie, US
★★★★★ 5
Great socks, watch out for bad seller
Number of Items: 6, Color: Black (6-pairs), Size: Medium
The socks are great, comfy, padded where you want it. I used these for work socks; I have a blend of corporate desk life and maintenance work. I like the low cut so my shoes don't rub the back of my ankle but not so high that socks always fall down. Great for running and sports as well. Been using these for years. Buyer beware though of the particular seller Liegnitz Group: They were late shipping, sent me the wrong socks so I sent for a return and they send me the right ones. My return got delivered back to them but they did not process it and did not send out any new ones. They cancelled my order and acted like I got the right ones all along. Buy from a different retailer.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 8, 2024
T
Verified Purchase
Terry Hale
Waukegan, US
★★★★★ 5
Comfortable with perfect fit
Number of Items: 6, Color: White (6-pairs), Size: Medium
I have had these socks for a few weeks now and wear them when running. I have small feet at a men's size 7 and they fit perfectly. Most men's socks are to big for my feet. They are pretty thin but well made and have good cushion. I recommend these for anyone that likes ankle socks for athletic activities.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2024

recommand products