Does this come with a certificate?

Thank you so much for your interest in our products. The 365510 is able to receive a Certificate of Compliance by us after the purchase. Also, if you pay the additional difference, it can receive a traceable NIST calibration certificate. Be sure to check the part number for it 365510-NIST

how quickly do the temperature and humidity readings get updated? in a minute, or in ten? and its real size?

The temperature updates within seconds while the humidity may take a few seconds more to stabilize and prodcue the display.

how tall are the numbers?

Mine, which is a model 365510 has numbers just a shade under 3/8", probably closer to 5/16". I find them adequate for the job at hand.

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