Measuring ranges: Photo/laster:5-99,999RPM Contact:5-19,999RPM,0.05-1,999.9m/min (0.2-6,560ft/min) Measuring distance: Photo type max.0.6metre & laser type max 2.0 metres Measuring angle: Photo type less than 60° & laster type 120° Resolution:0.1RPM(<1000RPM),1.0RPM(>=1000RPM) Accuracy:±0.05% + 1 dgt Laser output:=<1mW,Class II sampling time:1sec.(Over 6 RPM) Dimensions:190*72*37mm Weight:approx.200g Quantity:20pcs Dimension:56*35.5*29cm G.W.:20KGS N.2.:18KGS