1. Do not touch the probes directly with your hands to avoid electric shock and ensure personal safety during testing. 2. Before use, inspect the test probes to ensure there is no insulation or exposed metal. 3. Do not use the current and voltage ranges interchangeably to prevent damage to the instrument. 4. It is best to remove the batteries when not in use for a long time to prevent battery corrosion of other internal components of the instrument. 5. If you do not know the magnitude of the voltage or current to be measured, start with the highest range and then select the appropriate range based on the measured value. Color:A:Black/B:Red Material:plastic Package Contents: 1 * Pen line 1 * Multimeter(Without 9V battery) 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.