IP54 PROTECTION: IP54 industrial-grade digital caliper with quadruple protection, waterproof, dust-proof, and oil-proof and rust-proof, which make it more durable, stronger, longer service life. | PRECISE MEASUREMENT: Stainless steel digital caliper measuring range: 0 -6" / 0-150 mm; Accuracy: ± 0.001"/ 0.02 mm; Resolution: 0. 0005"/0. 01 mm. Thumb roller and locking screw help you make easy and accurate measurements. Perfect measuring tool for Professionals/Household/DIY Measurement. | AUTO-OFF & ZERO SETTING: Digital caliper will automatically shut down after 5 minutes of inactivity without manual operation, saving more battery power. The zero setting allows you to press the button at the position where you need to adjust the zero to continue the next measurement. | 3 UNITS CONVERSIONS: Simple unit conversion operation,one button to quickly switch among three measurement modes, including inches, millimeters and fractions, which can easily improve work efficiency. | 4 MEASURING METHODS: The digital caliper uses upper and lower jaws and a long handle to easily measure the internal diameter, external diameter, depth and step measurement. 4 measurement methods to meet your different needs, suitable for measuring jewelry, devices, hardware, woodworking, etc.