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The GSP3 will identify methane, butane, propane and other flammable gasses up to 2000 ppm, with sensitivity from 50ppm.
You can choose an instrument with an attached sensor or with a sensor on the end of a flexible 15" arm making it easy to access difficult to find gas leaks.
Gas levels are indicated by 2 bright red LEDs. at the same time an audible signal, proportional to the gas concentration.