The measurement accuracy reaches ± 5% +3, and the display of voltages condition help users quickly identify circuit problems Specially suitable for electricians and maintenance personnel, improving work efficiency and reducing troubleshooting time Not voltages detection, supporting a ranges of AC12V-1000V, to avoid the risk of electric shock caused by direct for users The double prompt design of the buzzers screen allows users to detect changes in condition during detection, making it more suitable for a wide ranges of environment It can still be clear and loud in noise environment, making it for home users and professional electricians to use It includes functions such as live / neutral line recognition, breakpoints search, and more, meet different electrical detection needs, and multifunction device can complete multiple tasks The device can automatically shut down after 5 minutes of inactivity, extending battery lifespans and maintaining a standbys at any time Solved the problem of frequent battery replacement, suitable for long time project and outdoor operations