Cable Testing: 1. At first, turn the rotary switch fully clockwise to test the battery strength. The battery LED light bright green if the internal battery is fully charged. 4. If no LED lights than there is no connection and the left side contact "1"is "floating" due to design or an "open" in the cable. Set the rotary switch to "2" to test contact 2, and so on, until all contact shave been checked. 2. Then plug one end of the cable into the appropriate jack on the left side panel of the cable tester, Plug the other end of the cable into the appropriate jack on the right side panel. Set the rotary switch to "1" to test the connection of contact 1 on the plug inserted into the left side panel. 3. lf there is a connection, the Green LED light below "1" and a Yellow LED light above each contact on the right side plug connected to "1" on the left side plug. Use the charts below to verify proper cable connections. 5. If the Ground LED lights than there is a connection between the corresponding contacts and the chassis. To test the cable with a banana plug, just plug each end of the cable into the banana jacks. The LED light and the unit beep a tone if there is a connection between the plugs. These banana jacks can also be used for continuity tests using two probe leads., Weight: 3.67731053016 pounds, Manufacturer: Xnuiasqe