This is a cost-effective and widely used transistor detector. You can use it to detect NPN and PNP transistor, capacitor, resistor, diode, double diode, zener diode, N-channel and P-channel MOSFET, triac and battery etc. Specifications: Type: Lithium battery version / Dry battery version (Optional) Power Supply: Lithium Battery Version: 3.7V 250mAh Lithium battery Dry Battery Version: 2 * AAA batteries (not included) Material: ABS Display: Large Graphic LCD Screen Diode Range: Forward voltage <4.50V Zener Diode: Transistor Test Area: 0.01-4.5V Capacitor: 25pF-100mF Resistor: 0.01-50M Inductor: 0.01mH-20H Item Size:89 * 71 * 22 mm / 3.5 * 2.8 * 0.87 inch Item Weight: Lithium battery version: 100g / 3.53oz; Dry battery version: 96g / 3.39oz Package Size: 115 * 83 * 29 mm / 4.53 * 3.27 * 1.14 inch Package Weight: Lithium battery version: 143g / 5.04oz; Dry battery version: 136g / 4.8oz Note: Be sure to discharge before testing the capacitor. Otherwise, the instrument will be directly damaged. This instrument is an active instrument. Do not use this instrument to measure the live circuit board, which will cause circuit board damage. Package List: Lithium Battery Version: 1 * Transistor Tester 1 * Electronic Component Set 1 * Cable 3 * Test Hook / Dry Battery Version: 1 * Transistor Tester 1 * Electronic Component Set 1 * Screwdriver 3 * Test Hook