I sometimes work with one of my brothers when he’s trying to find leaks in heat pumps. Apparently, some of the line sets in the Fujitsu units have small leaks. Trying to find them can be a very time-consuming, lengthy process. I’ve worked with him on at least two occasions trying to find the impossible leak. All of the refrigerant needs to be removed from the lines first. Slow leaks are of concern to the EPA and should be dealt with promptly.The refrigerant recovery tanks are at the ready, but once the refrigerant is weighed and put back into the lines the search is on. All of the slim duct has to be removed from the side of the house, leaving all the lines exposed. It’s not quite as easy as finding a refrigerant leak in a car, but a rather tedious process. Sometimes the leaks are so tiny, we’ve had to repeat the process a couple of times. This Elitech infrared refrigerant leak detector is going to be making the whole process a lot more streamlined.I don’t have an HVAC license or certification, but rather work with my brother, who does have all the required certifications to work on heat pumps. Eventually, when we both retire, we hope to work together. He installed my heat pump and, if need be, I can find any leaks in the system. I have most of the equipment, but this infrared refrigerant leak detector is a major purchase for many and I wanted one of my own. They do have some very inexpensive detectors, but this one is for the professional who will use it frequently.I do like the facr that the Elitech has a sensitivity adjustment key. For those very tiny, tiny leaks I’ll need to adjust the sensitivity to high. There are three sensitivity levels: Low, Medium, High. The probe is flexible and the tip can easily be placed in strategic areas where leaks can occur. The TFT LCD bar graph is a great visual which can show the intensity of the leak. Infrared detection is a big plus and the easy of setup and operation makes the Elitech a refrigerant leak detector a contender.WARRANTY: 1 yearWHAT’S IN THE BOX:Elitech ILD-300 Infrared Refrigerant Leak DetectorExtra filtersUSB charging cable / AC plugUV lightFEATURES:+ Maximum sensitivity is less than 4g / yr+ L- M- H, three levels of sensitivity adjustment+ Self-test function starts one power is on+ Leakage peak recording function+ Electricity indication+ Sensor fault alarm+ TFT LCD display, displays the leakage more intuitively+ UV LED instantly lights up, no need to warm up and can achieve 100% UV output+ Automatically shuts down after ten minutes with no operation+ Shuts off the hardware circuit function so that the battery can be used for a longer time+ Open or close the buzzer in the “On” button and can be applied to all occasions+ Earphone function so you can hear the alarm clearly, even in a noisy environment+ Built-in high-capacity rechargeable lithium battery that is more environmentally friendly and has a longer service life+ Flexible probe that can be used to detect leaks in a narrow space