Originally Posted by
noisebeam
Yep, seems to be left over from the 70's when perhaps radar systems were not as accurate as they are today. 10% error allowance is huge. 1% is more reasonable.
Al
If that's the case, then I'm sure the calibration records of the device should bear that out. I wouldn't trust any instrument without seeing its calibration characteristics, whether it be a voltmeter, oven, or radar gun.