Nikon autocollimator 
Measurement accuracy
Accuracy 0.5 seconds (repeatability error f +/- 0.2 seconds)
Within 1/60 degree, within 1/7200 degree
Within 1/3 degree, within 1/1800 degree
 
Measurement accuracy range is
0.5 arc seconds within 1 minute range
2.0 arc seconds within 20 minutes range
 
 
*Remark
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