It can be used as an electric pen to measure electricity over the air. the circuit maintenance is safe and secure Different electricity measurement can measure the inner line of the wall. quickly find breakpoints and improve the work efficiency of electricians Colour:As Shown Material:Metal+Plastic Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * electric screwdriver 1 * bit 1 * slotted bit 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.