Multi-function: Our electronic tape measure has practical functions, such as straight line measurement, round measurement, arbitrary curve measurement, irregular surface measurement, cylindrical diameter measurement, accumulation/subtraction 99m ultra-long distance measurement: 0-99m practical distance measurement and 99m maximum distance measurement (automatic accumulation). Data - Millimeter-level precision measurement data can be automatically accumulated and subtracted, and 10 groups of historical records can be called up at any time, which is convenient and practical. Lightweight and portable - 15mm thick and 35g. High-tech Microprocessor: Adopts low power consumption microprocessor to achieve super long standby time and battery life. Note: The data is manual measurement, please allow 1-22cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.