Ammeter pointer to make sure there is no in the circuit through and determine if the power supply polarity. If the pointer to the right, then the direction of in the circuit in electric meter from end flow and, on the other hand. Features - Color: Assorted Color. - Material: Plastic, metal. - Size: 13.30X9.80X9.80cm/5.23X3.85X3.85in. - Ultra sensitive: -30-0-30 range. - Ammeter pointer to make sure there is no in the circuit through and determine if the power supply polarity. If the pointer to the right, then the direction of in the circuit in electric meter from end flow and, on the other hand. - Check the circuit when there is a small potential difference between two points, can be directly connected in parallel.On the two points in the circuit to be measured, see if the pointer deflection deflection to determine whether there is a potential difference between two points in with the direction, can determine the level of electric potential between two points. - For detecting electric and potential difference, which cannot accurately measure the in both strength or electrical potential difference between two points, but only as a galvanometer , Electromagnetic induction experiment available g. - Not knocking and rattling. Before the products leave the factory after technical verification , please do not remove. - To keep the instrument clean, not affected by corrosive gases penetrated and the effects of fields in the vicinity. Package list: 1 x Sensitive Galvanometer