Precise & Accurate Kynup digital caliper has a measurement range of 0 - 6'/ 0 - 150 mm; accuracy to 0.001 /0.02mm and resolution to 0.0005"/0.01mm. Perfect and accurate caliper measuring tool for household or DIY measurement. Please choose stainless steel digital caliper for more accurate measuring. 3 Units Conversion You can switch 3 units with the calipers: inch, mm and fraction based on your habits with the push of a button. Press the on/off button, slide the digital caliper to anywhere, then you can read the values on the display. And you can reset it to zero by zero button.