The testo 755 current/voltage testers are fast and easy to use, especially when you are testing many circuits. The convenient open-jaw current tester automatically turns on when voltage exceeds 6V. It then auto-selects the correct parameters and range for your test. These rugged testers are suitable for virtually all your daily electrical measuring tasks. The instruments include important functions such as current, voltage, resistance & continuity. The integrated flashlight enables users to work in poorly lit areas. he overall design is for convenient testing including interchangable measuring tips which can be easily updated and maintained. A convenient lead holder is integrated into the housing for safe and easy storage.