"PROVIDES SOLID STATE SURVEILLANCE AND CALIBRATION OF GAGE BLOCKS; SYSTEM CONTAINS A SOLID STATE AMPLIFIER AND GAGE BLOCK COMPARATOR; DIGITAL READOUT METER HAS A RANGE OF PORM 199.9U IN, PORM 5U METER, AND MINIMUM DIGIT VALUE OF 0.1U IN, 0.01U METER; STEPPING SWITCHES ALLOW A SERIES OF GAGE BLOCKS TO BE GAGED WITHOUT MECHANICAL ADJUSTMENT"