Mitutoyo 543-783B Absolute Digimatic Indicator, ID-S-Type, Flat Back, #4-48 UNF Thread, 3/8" Stem Dia., 0-0.5" Range, 0.0005" Resolution, +/-0.0008" Accuracy, Meets IP42 Specifications Electronic indicator measures 0 to 0.5" (0 to 12.7mm) with 0.0005" (0.01mm) resolution and + or - 0.0008" accuracy, for measuring short, linear distances in mechanical engineering, machining, and manufacturing applications LCD displays in both inches and metric units, and indicator has a flat back for stem/plate mounting Absolute electrostatic capacitance-type linear encoder for accurate measurements 3/8" diameter stem and a #4-48 UNF contact point thread mount Ingress Protection certified IP42 for protection against objects greater than 1mm and dripping water