Already bought 3 pieces. 2 worked fine, but after about a year the third's display stopped working. I thought it might be a battery problem but a new battery didn't help. You can still press the buttons and see the temperature, but it doesn't show up for long. They seem accurate enough, but I can't say exactly how. I mainly use them to monitor sudden temperature changes. My heating broke down once and I didn't realize it until it was too late.
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