Not sure if anyone else does this, but I use a small Printing Adding Machine (about $20) to record date/time/temperature and counts while doing my measurements.
I find it much easier than trying to write out the information. Plus, when doing the calibration ride, I can quickly calculate the total counts of each of the four rides.
Plus, having a adding machine is quite handy when having to stop to make calculations while on the course.
Below is image of tapes from information on a 5km course I recently measured. I, of course, carry pen and spiral notebook to make notes and to draw diagrams for splits/etc.
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