I had two FR 935 (replace when sensor cracked) and both were really accurate on number of floors climbed daily. I've had my 945 for about a year, and it has never been even close to correct number of floors climbed. It shows zero most of the time, but might show four to seven if I really climbed more than fifty. I am referring to actual floors climbed, not a stair stepper or similar. I have read older posts that were similar and users mentioned calibrating barometer or altimeter without explanation. If there is a way to calibrate the barometer or altimeter or both, would somebody please share that information? I appreciate any advice.