I purchased a Casio PRO TREK Triple Sensor watch that monitors and records altitude, barometric pressure, temperature & has a compass built in. The altitude function is extremely inaccurate. I have talked with both Customer Service and Repair Service in NJ many times. Twice, they told me to send the watch in for repair. Twice, they have said that the watch meets specifications while testing in their laboratory and returned it to me. This testing was done at a fixed altitude since they do not have the facility to test under varying... read full review »