SKU: 76506941404

MASTERCOOL 55900 Blue Refrigerant Leak Detector

$165.36 $183.73
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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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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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4.5 ★★★★★
Based on 16 reviews
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Product Reviews
M
Verified Purchase
Melissa Withers
Birmingham, US
★★★★★ 2
Not as durable as it looks
Style: Snake
Our half pittbull and half american bulldog tore this apart in 5min.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026
A
Amazon Customer
West Palm Beach, US
★★★★★ 5
Good looking toy that has held up well
Style: Coyote, Style: Coyote
Very durable toy that our little dog especially loves. It's the perfect size for a small dog and she doesn't destroy toys anyway so it's been great. It does feel very durable though and would take our chewer a little while to get to it as well. I'm not sure it looks like a coyote but the dogs don't seem to mind. It's an attractive toy that looks great and is constructed well so it's not like a slobbery mess when left out. Good value for the money and would make a great gift because it looks higher quality than most toys.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
S
StarReviewer
Grantham, US
★★★★★ 1
May be ballistic nylon, but the seams are flimsy.
Style: Gator, Style: Gator
I really wanted my pup to like this toy because it looks great and feels solid at first. The design is fun, the material seems tough, and it definitely gives the impression that it can handle some rough play. Unfortunately, that didn’t turn out to be the case at all. After just about 5 minutes of play, the top seam split open and stuffing started coming out. This wasn’t even extreme chewing, just normal play, and it failed almost immediately. As you can see in the photos, the tear happened right along the top seam, which is exactly where you’d expect a toy to be reinforced. Once it opened up, the toy was essentially done. For something marketed as ballistic nylon, this was really disappointing. It might be fine for very gentle dogs, but if your dog has even moderate chewing habits, this likely won’t last. Based on my experience, I wouldn’t recommend it. especially at 19.99 which is the price at time of my review, I feel it does not offer good value for money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
A
Amazon Customer
New York, US
★★★★★ 5
A Surprisingly Tough Favorite for All Four of My Dogs
Style: Armadillo, Style: Armadillo
I wasn’t sure what to expect from the Hound 2.0 stuffed armadillo toy, but it has been a total hit in my house. Neither the dogs nor I have managed to find the squeaker yet—so it’s either missing or extremely well hidden—but honestly, the dogs don’t seem to care at all. They love this thing. I have four dogs ranging from a 22 lb Boston Terrier to an 85 lb pitbull, plus two medium Blue Heelers in between, and this toy has been thoroughly tested by every size and play style. I was a little unsure whether they’d like the harder “shell” portion of the armadillo, but they actually love it. It gives the toy a unique texture and makes it feel more durable. Before this, I knew nothing about the Hound 2.0 brand, but I’m a fan now. My little Boston Terrier is notorious for ripping every toy he touches, and this armadillo has stood up to him like a champ. The tag said it was made for outdoor play, wrestling, and chewing—and that’s absolutely true. I haven’t taken it outside yet, but inside it has survived rough play from all four dogs and still looks brand new. I also love that each toy in this line is a different animal with the hard parts in different places. It makes them feel unique instead of just the same toy in different shapes. I’ll definitely be buying more of these. If you have a pup—big, small, or anywhere in between—I’d recommend giving this toy a try. It’s been a winner in my multi‑dog home.
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Reviewed in the United States on March 10, 2026
J
J S
Carnegie, US
★★★★★ 4
Unique armadillo design
Style: Armadillo
I love the look of this armadillo toy. The flexible rubber shell gives it a spiky texture. It has reinforced nylon seams and printed eyes. The feet allow the toy to stand on its own, daring dogs to come knock it over. With a body length of 12" and standing 5" tall, the toy is of good size for even larger dogs, but it intimidated my 8lb yorkie mix. She found the hard shell and spikes off-putting and not fun. The toy is supposed to squeak, but either mine was broken or buried too deep to be useful. This was disappointing because I think a squeak would have helped my pup engage with the toy because she can't resist a noisy toy. I'd recommend this armadillo for larger dogs than my tiny pup. It seems durable with that rubber shell around the body.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 16, 2026

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