The MT21 is a 600 AC/DC Voltage Compact Multimeter with double moulded rubber housing and meets the International Standard IEC-61010-1 CAT lll 600V. The large LCD display screen has a white backlight for use in arduous areas. It is a very economical tester ideally suited for everyday use by electricians, electronic technicians as well as the air conditioning industry. The MT21 is a basic 2000 count multimeter and is designed to efficiently support the first level electronic and electrical trouble shooting. The meter measures AC and DC voltage to 600V, resistance to 2000 ohms, and DC current to 10A, plus has a diode test function and a continuity buzzer. An added function of the MT21 is the battery test ranges, which test 1,5V and 9V batteries with a load.