We are offering four channel lcd display unit. Four channel lcd display with input keypad. absolute comparative measurement auto calibration facility singledouble master calibration facility individual red, green and red led’s individual status of four parameters(red-reject, green ok, yellow-rework). one tri colour led for combined status of four parameters (red reject, green ok, yellow-rework) rs- 232 output metric inch measurement static dynamic reading mode- max, min, avg, tir resolution 0.1μm 0.5μm1μm