Sunday, October 4, 2009

Protrek PRG80 - Altitude Meter

This is a follow-up entry of this entry. I further tested the altitude meter of this Protrek PRG80. The reading seems to vary quite a lot, depending on the weather conditions.

What I did was I put the watch at exactly the same location, which is atop my bookshelf and near the window. I took a number of readings over the day. Below are the results.

1. Temp=28C, Alt=35m
2. Temp=30C, Alt=55m
3. Temp=31C, Alt=70m
4. Temp=30.8C, Alt=65m

It seems like the altmeter reading varies. Of course, in this experiment, the watch was left on the shelf, instead of being worn on a wrist. According to the user manual, to get accurate altmeter reading, you should wear it on your wrist so as to minimize any temperature fluctuation. On the other hand, if you want to get an accurate temperature reading, you should remove your watch from your wrist to minimize the influence of your body temperature.

And then you are not supposed to wear this watch near electronic gadgets such as computers, TV sets, etc. That's quite a pain.

1 comment:

  1. The altitude readout will change with differences in atmospheric pressure.