The VIVOHOME Refrigerant Leak Detector is a straightforward tool for anyone working with HVAC systems, car ACs, or refrigerators. It uses a solid-state semiconductor sensor to catch leaks as small as 0.1 ounces per year. That covers all common refrigerants—CFCs, HCFCs, HFCs, and HFOs like R1234yf, R134a, R410a, and R22. It also handles blend refrigerants approved under SNAP rules.

Three adjustable sensitivity levels let you dial in the detector based on the job. Set it low for a quick sweep of a large area, then crank it up to pinpoint the exact drip. The audible alarm increases in frequency as you get closer to the leak. It runs on batteries, so there’s no cord to manage while you’re crawling under a car or behind a fridge. The yellow casing is easy to spot on a cluttered workbench.

The trade-off is that semiconductor sensors can be slower to react than heated diode types, especially on small leaks. You’ll need patience to let it stabilize in a new environment. But for the price, this detector covers a wide range of refrigerants with enough precision for most service calls.