I have a Honeywell 9500 series thermostat which I checked temperature with a laser temp meter, and used a temp probe on my multi-meter. All match. I then brought the movable sensors next to the thermostat and then using the offsets I calibrated them. I returned them to their location waited for them to stabilize. Then brought the laser temp meter to the sensor location and rechecked. All matched. What I did with the non movable sensors was to use the laser to check the local temp next to the sensor and adjusted from that. For humidity I used a remote calibrated hydrometer from a weather pro to check those.
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