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I love this watch and never travel without it. I followed the instructions in the manual and use the thermometer a lot. To get an accurate ambient air temp reading I just take off the watch and wait about 8 minutes in the shade. You can also calibrate the thermometer and found the factory setting to be dead accurate! I discovered that if you read the temp while wearing this watch it will read your skin temp and have found this to be very helpful in monitoring my skin temp. Anything less than a 83 degrees means I am starting to get uncomfortably cold and need to warm up. 86 degrees skin temp is perfect for me. Knowing this allows me to tell if I have a fever or just over worked etc.

I use the altimeter alarm function when I fly to alert me of a faulty cabin pressure system during my commercial flights. I set my PAG 40 alarm to 8000 which is the maximum altitude pressure allowed in passenger cabins set by the FAA. If the cabin pressurization goes above 8000 ft the alarm will sound on the PAG 40. There is a graph at the top of the screen to check your altitude history. The graph is also used for tracking barometer history.

I calibrate my altimeter daily to get an accurate reading since the barameter will change by the hour.

The compass feature is great and you can also calibrate that too. I find the compass usefull at night and on heavy overcast days.

You get 5 seperate alarms and a short alarm for the top of each hour. All the alarms can be turned off or on seperately.

The stopwatch function does split times and single timing. It will not do laptimes for example timing laps at a race on after the other.

It runs on 4 batteries part# 395. Which I was able to change them myself.

Watch speed calibration was also accessible!

The display is large and easy to read.

I have owned my Casio PAG 40 for two years now.

The watch band has held just great so far and the watch is free of defects.

I plan to buy two more of these watches.