A freind of mine and a fellow racer bought that same Kestrel unit several years ago, he was amazed when he found out how much the humidty changes made on his cars performance
I have compared my old, cheap analog gauges and a used Performaire Eclipse unit I bought to his unit, theey where close to each other. You will neeed to take your new unit to a known accurate weather station location and set the unit up before using it. I recommend taking it to a airport that has either a weather observer on the field or to a airport that has a AWAS (airport Weather Observation System) or ASOS system station (Sorry, I don't remember what that acronym stands for now
) It is a automated weather reporting system also that is availble to pilots by remote use on a dedicated radio channel
The airport people should be able to allow you to listen to it, if not ask them for the phone number of the unit
Try and get their weather information from 10 minutes before the hour to 10 mintues after the hour, they update the weather once a hour between 15 mintues and ten minutes before the hour, every hour. Most of those stations have a phone number you can call also
Good luck
I have had a weather station for a long time, my first one was a dinosuar compared to the new units like the TAG, Permaires, Kestrels and all other ones availble now
The main thing I have learned is to look at the weather changes(and write them down in a log format along with the times slips) and what happens to the cars performance, you will see a trend after a while and learn how that affects the car
Outside air temps, humidity, barometric pressure and track altitude all have a affect on the cars performance
High humidty, hot temps and high altitude tracks all hurt the cars perforamnce. Dry humidty, cold air and low level tracks are the best set up for going fast
Lean is mean, fat is slow
