Multi-function Ruler: Angle measurement range: 0-270°; Measurement length range: 7 inches / 18 cm. LCD Display and Backlight: The LCD screen displays an accurate angle and is easy to read. Backlit design for normal use in low light conditions. Lockable Angle: Press the HOLD button to lock the angle you have. 9V Battery: Long working time and duration. Don't worry about changing the battery repeatedly. (For regulatory reasons, batteries are not included). Easy to carry. Detail: Length: 260 mm Measure Angle Range: 0-270 degrees Measurement Accuracy: ±0.5 Power Supply: 9V battery (battery not included in air freight due to postal regulations) Attention: General industry standard. Due to different monitors, the color may have some difference. Due to manual measurement, please allow 1-3% tolerance.