TOPTES makes a portable gas detector that does one thing: finds leaks. The PT177 is a small orange device powered by batteries, so you can move it around the kitchen, near the water heater, or by the furnace. It detects natural gas, propane, methane, and other combustible gases. That covers most homes with gas appliances.

Before using, you need to let it warm up for 30 seconds in clean air. Then it auto-calibrates. After that, you hold it near suspect areas. If it finds gas, you get a loud audible alarm and a flashing visual alert. It responds quickly, which matters when you smell something off but can’t find the source. The battery power means you aren’t tethered to an outlet while checking behind the stove or under the sink.

There is no digital readout for concentration levels. The alarm just tells you gas is present. For a simple leak sniffer that costs under $30, that trade-off makes sense. It is a practical tool for routine safety checks, not a lab instrument. Keep it in a drawer near the gas line, and you will reach for it more often than you expect.