Electronic Ruler For Rolling Measurement Of Cylindrical Irregular Surfaces With Straight And Curved Surfaces Multifunctional Digital Display Roller Ruler ✿Features: ✿- measurement: 0-199.999 meters measurement range, millimeter- accuracy, more practical and more accurate. ✿HD LCD screen: Clear large screen with backlight digital display, the measurement results are clearer, and the dark environment does not affect the reading. Automatically shut down after 3 minutes of no . ✿-long battery life: Built-in 260mAh low internal resistance lithium polymer battery, which can achieve-long standby up to 300 days after full charge. Can work continuously for 6 hours without interruption. ✿Unit switching: 5 commonly used distance measurement units can be switched -MM/CM/M/IN/FT. ✿Data storage: 10 groups of data can be stored for easy query. After exceeding this limit, it will cycle from the first group. ✿Product Description: ✿Material: Plastic ✿ - measurement: 0-199.999 meters measurement range, millimeter- accuracy, more practical and more accurate. ✿ HD LCD screen: Clear large screen with backlight digital display, the measurement results are clearer, and the dark environment does not affect the reading. Automatically shut down after 3 minutes of no . ✿ -long battery life: Built-in 260mAh low internal resistance lithium polymer battery, which can achieve-long standby up to 300 days after full charge. Can work continuously for 6 hours without interruption. ✿ Unit switching: 5 commonly used distance measurement units can be switched -MM/CM/M/IN/FT. ✿ Data storage: 10 groups of data can be stored for easy query. After exceeding this limit, it will cycle from the first group.