Clockwise Tools DIGR-0055 Electronic Digital Dial Indicator Gage Gauge Inch/Metric Conversion 0-0.5 Inch/12.7 mm with Back Lug Auto Off Featured Measuring Tool Inch and Metric Reading Function Extra Large LCD Screen: 1.6" x 0.7"; Auto Off after 5-7 mins (previous measure result become 0 when turn on again) Flat Back or Lug Back Option Included (hole size 6.5mm); Stem Diameter: 3/8"; 4-48 UNF Threaded Tip Measure Range: 0-0.5"/12.7mm; Graduation: 0.0005"/0.01 mm; Accuracy: 0.001"/0.03 mm RS232 Data Transfer with our cable; Professional Certificate Included Clockwise Tools DIGR-0055 and DIGR-0105 Two Sizes Available Inch and Metric Reading Function Measuring Range: 0-0.5&#034;/12.7mm and 0-1&#034;/25.4mm Graduation: 0.0005&#034;/0.01 mm; Accuracy: 0.001&#034;/0.03 mm Extra Large LCD Screen: 1.6&#034; x 0.7&#034; Flat Back or Lug Back Option Included (hole size 6.5mm); Stem Diameter: 3/8&#034;; 4-48 UNF Threaded Tip User Guide Included One Spare Battery Included Professional Cert. Included Magnetic base. Max pull 176lbs. 2 magnetic faces available Turn switch <span class="a-text-bold">ON</span> to activate magnet; <span class="a-text-bold">Off </span>to deactivate User Guide Included One Spare Battery Included Professional Cert. Included Twist the black knob 2 to adjust and lock A, B, C three joints Insert digital indicator into 3 and twist 4 to tighten it up. Please <span class="a-text-bold">NOTE</span> that <span class="a-text-bold">DO NOT TIGHTEN TOO MUCH</span>. Too much force will damage the digital indicator Twist 5 to adjust the digital indicator to the desired position before measuring Clockwise Tools DTCR-01 RS232 Data transfer cable for Clockwise Tools DIGR Digital Indicator ONLY Package includes One data transfer box and Two 59&#034; wires No battery needed and power is supported by computer No driver needed cable will be identified as keyboard