VERY sensitive! I smelled gas in the garage. So I called the gas company. They immediately sent a technician but they couldn't find the leak. The next day I still smelled gas and this tester came. So I checked the leak myself. He hit the gas straight away! I've also used a pen gas detector but it didn't work, probably because it's not that sensitive and only works when very close to the leak. In short, I was able to detect a gas leak with this tester when even a pro with a professional tester could not. This tester should be in every household.
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