Overview
The FNIRSI S1 is a revolutionary smart multimeter that redefines portability. It does away with the traditional clunky rotary dial, replacing it with an Intelligent Auto-ID system. Simply touch the probes to the circuit, and the S1 automatically identifies if you are measuring Voltage, Resistance, or Continuity. With its massive 9999-count resolution and stunning VA Color Display, it provides professional-grade accuracy in a device that fits in your shirt pocket.
Key Features
Smart Automatic Identification: No more switching dials! The S1 detects the measurement type automatically, reducing the risk of accidental short-circuits.
Large VA Color Screen: The black-background color display offers incredible contrast, making it easy to read in direct sunlight or dark electrical panels.
Ultra-Slim Design: Roughly the size of an iPhone, making it the most portable professional DMM on the market.
USB-C Rechargeable: Features a built-in lithium battery—no more hunting for 9V batteries during an urgent repair.
Live Wire & NCV Detection: Safely detect live AC lines without direct contact; the screen glows red and beeps when high voltage is detected.
Temperature & Frequency: Includes high-accuracy temperature measurement and frequency testing, perfect for HVAC and IoT work.
Technical Specifications
| Feature | Range / Specification |
| Max Display | 9999 Counts |
| Voltage (DC/AC) | 0.5V ~ 1000V |
| Resistance | 0Ω ~ 100MΩ |
| Capacitance | 10nF ~ 10mF |
| Frequency | 10Hz ~ 10MHz |
| Temperature | -40°C ~ 1000°C |
| Diode / Continuity | Yes (Visual and Audible) |
| Safety Standard | CAT III 1000V |
Who is this for?
Field Service Technicians: The slim profile is perfect for carrying all day without the bulk of a traditional meter.
Home DIYers: The “Smart” mode makes it safe for beginners who are afraid of setting the meter to the wrong mode and blowing a fuse.
Gadget Lovers: The sleek, touch-button aesthetic makes it a standout piece of kit for any modern electronics lab.

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