Absolutely precise measurements and conversions: This caliper allows you to obtain the precise data using internal, external, pitch and depth measurements in inches and millimeters. Calibrated to 0.01mm. Secure the faces in place and set to zero for different measurements. Also provides automatic power off. Simple and comfortable to use: Designed for home, DIY and professional use, this tool is so simple yet incredibly precise that children can use it. The ergonomic design provides a comfortable grip and features a large LCD screen. The measuring faces fit with a machine grooved knurled roller that provides easy sliding and precise position locking for a secure fit. Instant conversion between measurements eliminates the headache of doing your own math. Compact, convenient and premium quality: This 150mm caliper is small enough to fit in your pocket. As for the price? We promise our vernier caliper is made of hardened stainless steel without plastic parts, stronger than other brands. It is guaranteed against water, dirt and oil. Heart to Heart Service: Packaged in a sturdy molded case, this digital measuring tool comes with an ultra long lasting replacement battery and a screwdriver to change it. The kit works right out of the box and comes with a detailed user manual.