About This Dual Unit & Zero Setting:Neoteck electronic indicator features one‑press mm/inch switching and zero‑at‑any‑position , eliminating the need to recalculate baselines for tolerance checks . This means you get error‑free readings every time, without unit confusion or setup errors — fast, reliable measurements you can trust , proven by its simple one‑button operation 【0-12.7 mm Measuring Range】 Measuring Range from 0-12.7 mm (0-0.5 inch), High Resolution up to 0.001 mm (0.00005 inch) 【Included Rear Cover】Hole Diameter: 6.5mm, It is Removable and Can be Used on Different Magnetic Base Holder Stand 【Inch/Metric Conversion】Switchable between mm and inch, Suitable for All Kinds of Measurement 【Zero Setting with Conveniencet Ports】LR44 Battery Compartment is Easy to Replace Battery (Note: It Does Not Remember Zero Setting Position After Auto Off) Overview Brand : Neoteck Material : Aluminum Product Dimensions : 4.8"L x 2.17"W Range : 12.7 millimeters Measurement Accuracy : +/-0.001 millimeters