FNIRSI DST-210 3-in-1 Handheld Oscilloscope Multimeter Signal Generator

Carrying three separate bench instruments to every workbench, field repair, or classroom session is impractical, and this device is built to replace all three with one battery-powered handheld unit. Its oscilloscope function samples at 48MSa/s across a 10MHz bandwidth - genuine oscilloscope capability for audio and low-frequency digital signal debugging, not just a novelty display - while the true-RMS multimeter side covers the full standard measurement set (voltage, current, resistance, capacitance, frequency, temperature to 1300°C, diode/continuity).

The built-in signal generator outputs 13 different waveform types up to 50KHz, letting the same device that's diagnosing a circuit also inject a test signal into it - a genuinely useful combination when troubleshooting requires both stimulating and observing a circuit's response. A 3000mAh rechargeable battery with USB-C charging keeps it field-portable rather than tethered to a bench power supply, and the 2.8-inch color screen makes waveforms and readings easy to read without a separate monitor.

Common uses are field electronics debugging and repair where carrying a full bench setup isn't practical, education and hobbyist projects wanting oscilloscope capability without a dedicated bench unit's cost or size, and general circuit troubleshooting needing to both measure and inject signals from one portable tool.