Features of the sh-21 * quick measurement (few seconds) * best repeatability and precision portable unit * direct reading of hardness * easy to use hand held probe can be quickly applied to a variety of surfaces from any direction. * easy to use - no prior experience of hardness measurement techniques required * built in memory for data and calibration points * measures vickers, rockwell, brinell and shore scales * interchangeable probes for use with different surface profiles - pipes - concave surfaces, gears valves etc. * portable works with nicd battery see our full range of hardness testers laboratory services also available variety of metals including steel - best repeatability and precision, with adaptors for various shapes