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.
The multimeter supports a broad set of measurement functions, including AC and DC voltage, resistance, continuity testing with audible feedback, frequency measurement, temperature sensing, diode testing and battery capacity evaluation. It also features NCV (non-contact voltage detection), enabling safe identification of live wires without direct contact. Phase and neutral wire identification further extends its utility in electrical installation work. True RMS measurement ensures accurate readings of non-linear and distorted waveforms, which is essential for modern electronic systems.
The S1 integrates intelligent automatic range selection and smart measurement processing, reducing the need for manual adjustments and improving workflow efficiency. Built-in overload and anti-burn protection systems safeguard the device against incorrect operation and electrical faults, enhancing durability and safety. Additional features include data hold functionality, automatic shutdown to conserve power and an integrated flashlight for use in low-light environments.
Powered by a 1000 mAh rechargeable lithium battery, the device eliminates the need for disposable batteries and charges via USB-C for convenience and sustainability. Its compact design and integrated test pen functionality allow it to be used as both a traditional multimeter and a voltage detection probe, increasing flexibility in field and workshop applications.
Performance highlights:
• AC/DC voltage, resistance, frequency and temperature measurement
• True RMS for accurate waveform analysis
• NCV non-contact voltage detection
• Continuity, diode and battery capacity testing
• Phase and neutral wire identification
• Smart auto-ranging and data hold function
• 1000 mAh USB-C rechargeable battery
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