General Tools DMM40 Digital Multimeter with Bright Screen Display The General Tools and Instruments DMM40 Digital Multimeter with Bright Screen Display is a digital multimeter with an easy to read screen display This industrial tool is easy to use and measures AC voltage, DC current, resistance and checks continuity and diode integrity The screen is a large backlit 3-1/2 digit (1999 count) LCD display for a bright, easy reading measurement The instrument has 19 ranges and is CE approved and designed to meet CAT III 600V safety standards The power source is one 9V battery which is included along with a high-impact thermoplastic case, test leads, battery, and a user's manual