Colour:Black Material:plastic Size:13.3 x 9.8cm Package Contents: 2 x current teaching instrument Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. It can be widely applied in education, laboratory and scientific applications and industrial areas. When measuring current, it can be connected in series in the circuit. If the pointer deflects to the right, it indicates that the current flows from the positive end of the circuit in galvanometer. Vice . The transparent protective shell can prevent it from dust and reduce damage. The reading in the Galvanometer is quite large and obvious, which makes it easy to read and recognize. Check whether the pointer is aligned to zero before using it. When it is connected in series in the circuit, the higher end of the "G" terminal is used. Attention should be paid to disconnecting the power supply when connecting the circuit. Simple pointer , high accuracy, easy operation and sensitive to detect electric current.