FNIRSI S1 Digital Multimeter

The FNIRSI S1 is a digital multimeter designed for accurate and versatile electrical measurements in both professional and DIY environments. It supports AC/DC voltage measurement, resistance, continuity testing, frequency detection, battery capacity measurement and temperature reading. Additional functions include NCV (non-contact voltage detection), diode testing, phase and neutral wire identification and True RMS measurement for more accurate readings of non-linear signals. The device features a clear inverted VA HD display for easy readability, along with automatic range selection, data hold and overload protection. A built-in 1000 mAh rechargeable battery with USB-C charging ensures convenient and portable operation.