1. The resistance tester is made of ABS material, which is durable and has a long service life. 2. Small size, light weight, easy to operate, test range 0.01~19.9. 3.LED display with high precision can provide you with accurate resistance value. 4. Can test the resistance value of screws with such as EGO 510 808D M7 M8. 5. The of use is very simple, just install the battery, toggle the switch, connect to the object to be tested and it can be displayed. : Resistance measurement range: 0.01~19.9 Test error: 1~3% Voltage measurement range: 0.01-11.9V Power supply : 1.5V AA battery x 2 (battery not included in delivery) Display mode: LED screen (red) Product size: 69 x 49.6 x 26mm Material: abs colour: black Package Contents: 1 x Resistance tester 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.