Multi-functional measuring instrument electronic DIY kit, simple operation, easy to use. High-definition liquid crystal display, large LCD, digital symbols show clearly, easy to read. With multifunctional rotary gear, you can choose different functions, and measurement is more convenient. Can measure various non-polarized capacitance, polarized electrolytic capacitance, inductance, and frequency. Attention: 1. This product is a DIY kit and not the final product. 2. This welding project requires basic electronic knowledge and hands-on skills. 3. The delivery is in loose parts, which need to be welded and assembled by yourself. Some accessories are sent randomly and cannot be specified, which will not affect the use. Power supply voltage:USB-powered DC 5V (DC power socket) Measurement range of non-polar capacitance:1pF-2200pF Polarized capacitance measurement range:1uF-12000uF Inductance measurement range:1uH-1H Frequency measurement range:20Hz-400KHz Use tips: 1. the kit supply voltage is DC voltage 5V, try to use a power supply with fewer stray waves and stable output. 2. each time before powering on, all switches should pop up, and power on about 2 seconds before the display. 3. after the display, before installing the shell, adjust the potentiometer so that the voltage between pin 4 and pin 5 of the LM393 is 3.16V. 4. measure what components are rotated to the corresponding gear. 5. measurement of non-polarized capacitance, inductance does not distinguish between positive and negative, frequency and electrolytic capacitors to distinguish between positive and negative contact to determine good. 6. the tail number of the readings are not rounded and fictitious optimization, all the tail number has jumped is normal. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use