Digital multimeter Fnirsi FNIRSI S1 6000 counts auto range backlight

The FNIRSI S1 is a compact digital multimeter with a clear inverted VA color display and auto-ranging capability. It provides measurements commonly needed for electronics repair, household appliance troubleshooting, computer and automotive diagnostics, and basic electrical installation tasks. The device includes a rechargeable 1000 mAh lithium battery charged via USB-C and combines multimeter functions with non-contact voltage detection and a pen-style live/neutral check.

Advantages

The FNIRSI S1 supports AC/DC voltage measurement, resistance, continuity test with audible signal, diode test, frequency (Hz), NCV non-contact voltage detection, temperature measurement and True RMS for more accurate readings on irregular waveforms. It features automatic range switching, data hold, low-battery indication, automatic shutdown and a built-in flashlight. Smart anti-burn protection and full overload protection help prevent damage from incorrect connections. The compact ABS housing and VA backlit display improve usability in low light and confined workspaces.

Suitable for

• Electronics repair and PCB troubleshooting
• Household appliance maintenance
• Computer and automotive basic diagnostics
• Electrician and installer field checks
• Hobbyist and DIY electrical measurements

Key specifications

• Display: Inverted VA color screen with backlight
• Counting capability: Up to 6000 (display shows up to 9999 max range)
• Measurement functions: AC/DC voltage, resistance, continuity (audible), diode test, frequency (Hz), temperature
• True RMS measurement for accurate readings on non-sinusoidal waveforms
• Non-contact voltage (NCV) detection with light and sound indication
• Power supply: Rechargeable lithium battery, 1000 mAh, USB-C charging
• Housing material: ABS
• Safety rating: Category III up to 1000 V
• Dimensions: 143 x 75 x 19 mm
• Weight: 135 g

How to use

Charge the multimeter using the supplied USB-C cable until the battery is full. Connect the test leads according to the measurement type (voltage, resistance, etc.), select the required function if manual selection is needed, or allow the auto-range to choose the appropriate range. For NCV detection, use the indicated sensor area and observe visual and audible cues. Use the data hold function to freeze displayed readings when needed. Follow standard safety practices: ensure correct probe connections and observe voltage and category limits.

Recommendations

Regularly charge the internal battery and inspect test leads for damage before use. Use the NCV function to identify live conductors before connecting probes, and rely on the built-in overload and anti-burn protections as a last resort—always follow safe working procedures and protective equipment when measuring mains voltages.