Fowler 54-554-630 Xtra-Value External Electronic Caliper Gage, 0-6" Measuring Range, 0.01" Accuracy Measures 0 to 6"/0 to 150mm, with 0.01", 0.1mm, or 1/64" resolution Plastic electronic housing with stainless steel arms and hardware for durability Digital, single-value readout LCD shows inch and metric units for versatility when measuring Zero setting to take intermediate or differential measurements, and hold feature to freeze display for later viewing Spring loaded with locking nut for fast and efficient measurement of mass production parts