Type KJY Apertometer
Type KJY Apertometer is used to measure diameter of ring-gauge .it is primarily made of grating system and opto-electronic .
It is
specified as
measuring
instrument to ring-gauge in 1995 in(JJG).
Technique indicatrix
Range: (φ3.0 ~φ200)mm。
Distinguish power: 0.1um。
Repeatability: 0.2 μm
Maximum permissible error: ±(0.3+2L)um,L—length of measurement ,
meter as unit.