Product Description: Professional smart digital multimeter with high-definition display and compact design (147 85 4.2 mm), ideal for precise electrical measurements. Features 9999 display counts for clear and accurate readings. Supports both automatic and manual operating modes. Capable of measuring AC/DC voltage (0V ~ 620V), resistance (up to 60M?), capacitance (up to 99.99mF), continuity, diode testing, and live wire detection. The S20 model includes additional EMF detection functionality. Available in multiple versions: S10: Powered by 1.5V AAA batteries S11: Built-in 800mAh rechargeable lithium battery A10: Rechargeable via USB, optimized for cost-efficiency S20: Includes full feature set with EMF detection All models are equipped with smart detection functions, allowing use without manual configuration. Certified with CE, FCC, and RoHS. Recommended operating temperature: 0C to 40C. USB charging design - energy saving and environmental protection.