Features: Small size,easy to carry and storage. Two units available:mm/mil. Mainly used to non-destructively measure the paint thickness of car. Measuring range is 0.0 to 2.0mm or 0 to 80 mil. Made of durable material,anti-corrosion and wear resistance. EM2271 Specifications: Measurement range: 0.0 to 2.0 mm, 0 mil to 80 mil Accuracy: 2rdg -0.1 mm, or 2rdg-4 mil Resolution:0.1 mm/1 mil Power supply: 1 x 3 V button cell, CR2032 or equivalent, Measuring technology: Magnetic Size :6.9 x 3.8 x 2 cm Warning: 1.Battery: 1x 3V button battery not included 2. Do not use the device below 0 degrees Celsius. 3.The device is not available in measuring metallic paint on car or similar objects. 4.This tester may not be used to test your home appliances 5.For measurements in AUTO test mode and on object with steel substrate ±10 of reading 0.10mm most car is made of steel, and, if you get result of 0.00mm or 0.01mm , it is under normal condition,acceptable error, because most car paint thickness is 0.1-0.15mm. How the device work: 1.Probe Before measurement, place the tester with its probe firmly against target surface. 2. Display 3. TEST button Press TEST button to turn on the tester. Press and hold down this button for about 1 second to turn off the tester. Press TEST button to delete the reading on the display,the display will show - -. 4. UNIT button Press this UNIT button to select desired unit: mm or mil Package List: 1x Tester