INSTRUCTIONS IMPOSSIBLE. THERMOMETER INACCURATE BY +/- 5 DEGREES

I have a degree in engineering, and couldn't understand the instructions on setting after spending a half an hour reading them. When I finally did get the settings, the thermometer was off by 5 to 7 degrees (too high usually) measured against a professional mercury thermometer. I bought this as a check against a thermostat, and it was a complete waste. It would change temps five or more degrees just by moving it ten feet to another room or the hall. I will be returning both.

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