Desktop voltmeter is used to show the voltage between two points in your electric circuit. It has 3 binding posts. Connect the black binding post to the negative side of circuit and connect one of the red binding posts to the positive part of your circuit. Each of the red binding posts are for a different voltage range. One is for 0 to 15 volts and the other is for 0 to 3 Volts.
All three binding posts are marked with embossed letters.
Box Dimensions are: 10 x 9 x 6 cm