Accepting various plug-and-play probes, battery-operated Models 3810 and 3811 show Vickers, shore, Brinell, or Rockwell reading on large LCD. Both test at any angle and archive critical data. Model 3810 maintains ±0.8% accuracy at 1d=900; plots data on integral dot-matrix printer; and switches instantly among scales. It comes with style D impact device with tungsten carbide tip, calibration block, support ring, cleaning brush, battery charger, and manual. Model 3811 maintains ±0.8% accuracy corresponding to ±1 HRC at 58 HRC; exports data via RS232; and performs error modification and auto shutoff. It comes with test block and manual.