FNIRSI DST-201 3-in-1 Digital Multimeter: 19999 TRMS, 1MHz Oscilloscope & DDS Generator

Meet the FNIRSI DST-201: a versatile 3-in-1 tool for quick diagnostics

The DST-201 consolidates three core tools into a single handheld instrument. It functions as a digital multimeter, a 1 MHz handheld oscilloscope, and a DDS signal generator, offering a broad measurement catalog that covers AC and DC voltage and current, resistance, capacitance, frequency, diode checks, temperature, continuity, and live/neutral detection. Auto range and data hold make it practical for busy workbenches and field service alike. The 19999-count TRMS precision provides detailed readings without requiring separate devices.

Inside its compact chassis, you’ll find a 2.8-inch color TFT display with light and dark themes. The screen is easy to read in varying lighting conditions, and for prolonged work, the brightness is adjustable to reduce eye strain. A 3000 mAh rechargeable battery powers the unit through long field sessions; USB-C charging keeps you ready to go, and an auto power-off option helps conserve energy when not in use.

What you can measure and test

• AC/DC voltage, current, resistance, capacitance
• Frequency, diode checks, temperature
• Continuity, live/neutral detection, data logging

The DST-201’s scope capability complements its DMM functions. With up to 1 MHz bandwidth and a 5 MSa/s sampling rate, you can observe waveforms and edge transitions while testing circuits. The oscilloscope portion is designed to be intuitive for quick diagnosis, with vertical sensitivity options from 10 mV/div to 10 V/div and safe measurement up to 400 V.

DDS signal generator and practical uses

DS coordinates with the generator that outputs 13 waveforms up to 10 kHz. You can adjust amplitude from 0.1 V to 3.0 V for signal testing, waveform simulation, and calibration tasks. This makes the DST-201 a solid companion for electronics troubleshooting, automotive repair, and prototype iteration.

Designed for fieldwork and on-the-go workflows

• Compact, handheld form for in-vehicle diagnostics and equipment maintenance
• Durable interface with a dedicated function dial for fast mode switching
• Flexible data handling with logs of past measurements

While it is a capable all-in-one tool, it’s important to evaluate your project requirements and use cases. The DST-201 suggests possibilities—versatility, breadth of measurement, and portability—rather than guarantees. If you need a single device that covers multiple testing needs in tight spaces, this FNIRSI model could be a practical option to consider.