Capacitor discharge pens are used to quickly discharge the stored charge in high-voltage capacitors or AC capacitors in switching power supplies during product repair. This prevents residual shock during repair and protects the operator and the product from damage. The capacitor discharge pen uses a constant current source circuit for rapid discharge. The red and black test leads are used without polarity distinction. Simply place the test leads directly onto the capacitor to be discharged. Discharge occurs without and features an LED indicator. When the LED turns on, the capacitor still has charge, while when it turns off, it's almost discharged. This product is compact, portable, and versatile. As a professional repair technician, it's essential to have one readily available to protect both the product and yourself. Use it for discharge voltages below 800V, as higher voltages generate greater heat. Discharge voltages below 1000V are indicated by a 3-digit DC voltmeter. After the voltmeter turns off, continue discharging for another 10 seconds for a more complete discharge. It can discharge up to 1000V DC. Specification:B Color: White Material: plastic Package Contents: 1 * Capacitor discharger with test leads 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.