"CONSISTS OF DIGITAL READOUT SYSTEM,INDICATOR,PROBES,PROBE EXTENSIONS,115VAC/60 HZ OR TWO 9V TRANSISTOR BATTERIES,MEASURES ROUGHNESS OF FLAT SURFACES AND INNER OR OUTER DIA,ROUGHNESS WIDTH CUTOFFS OF 0.003,0.010,0.030,AND 0.100 IN.,INDICATES FROM 0 TO 2000 MICRO IN.,SINGLE SPEED RECIPROCATING DRIVE WITH ADJUSTABLE STROKE"