Microprocessor BasedAir-ele-units-Catalogue-5 Tri Colour LEDs showing acceptreject rework status on column. Unique Scaling Factor. RS232 0P. Wireless data transfer possible. Least Count: 5 pm, 1 u.m,0.5um,0.1u,m. Display of Absolute value or Deviation. Buzzer for Rejected Job. External Relay (Relay Output) Provision for foot switch.