Features Color: Silver Material: stainless steel Length: 400mm Measuring range: 0~999.9 < p>Resolution: 0.1 Accuracy: 0.3 Operating temperature: 0 ~ 50 Working humidity: 85% RH Battery: one CR2032 battery (included) Color: Black Ruler & digital protractor: A ruler with the function of digital protractor, capable of measuring length as well as angle at the same time. Say goodbye to complicated measuring or tracing work. Metric and Imperial system: Length measuring range 0 to 400 mm (the 2 rulers are all 7 inches). Angle measurement range 000.0 to 999.9, the ruler can be rotated more than 2 turns. Resolution 0.1; accuracy 0.3. Zero at any position (taring): Press the small "zero" button for one second, the value on the angle screen will be reset to zero and you can start the measurement at any corner. Turn the large knob in the center to lock/unlock the ruler at any angle, to avoid displacement or loss of the measured angle. Simple but durable: Simple design, but made of stainless steel , an excellent material ensuring exceptional solidity. The life of the button battery is over 2000 hours to solve any battery life concerns. Package content: 1 Classic Digital Ruler 400mm; 1 CR2032 button battery; 1 User Manual.