Crenova MS8233D Auto-Ranging Digital Multimeter Home Measuring Tools with Backlight LCD Display 100% Safety AssuranceBuilt-in Double Fuse. Overload Protection on all ranges. Auto-ranging TesterAccurately measure AC/DC voltage, AC/DC current, resistance, frequency, continuity, diode, etc. Backlight Display Designed with 3 1/2 digit LCD display and 'Backlight', showing the reading clearly in low light areas. Special Points Data Hold, Maximum Value Hold, Function Switching, Auto Power OFF. Sampling Speed: 3 times per second. 9V BatteryDON'T forget to install the 9V battery before using the digital multimeter, or it will go on strike.