"C/O ONE LEVER TYPE GAGE HEAD,ANALOG AMPLIFIER,A STABLE HEIGHT STAND WITH MOUNTING ADAPTERS FOR GAGEHEAD TO THE HEIGHT STAND.AMPLIFIER RANGE MIM +/-0.004 INCH,WITH ONE RANGE BEING +/-0.0002 INCH,AND A RESOLUTION OF 10 MICROINCHES.THE GAGEHEAD SHALL BE LINEAR TO +/-0.1% OVER THE FULL RANGE WITH AN ACCURACY NOT TO EXCEED +/-10 INCHES.OPERATE ON 120 VOLTS,COME WITH A BATTERY BACKUP.MIN. COLUMN HEIGHT OF 20 IN. EXTEND AT LEAST 10 IN. FROM THE COLUMN"