FNIRSI DST-201 vs FNIRSI DST-210: Best Oscilloscope Multimeter for Field Service? I’ve been testing two of FNIRSI’s latest handheld oscilloscope multimeters side-by-side: the DST-201 3-in-1 (with its built-in DDS signal generator) and the upgraded DST-210 2-in-1 (boasting a much faster 48MS/s sample rate and 10MHz bandwidth). Both promise to replace a handful of tools in … Read more

When you use the signal generator function on your FNIRSI multimeter, you might wonder if you must turn it off by hand each time. This matters because leaving it on can drain your battery faster than you expect. The truth is, most FNIRSI models do not automatically shut down the signal generator when you switch … Read more

You might be wondering if your FNIRSI multimeter can handle digital data bus analysis. This matters because many hobbyists and technicians want to test communication lines without buying expensive gear. The truth is, a standard FNIRSI multimeter can measure basic voltage levels on a bus, but it cannot decode complex digital signals. For that, you … Read more

Many of us who use FNIRSI multimeters have wondered why there is no built-in magnet on the back for hands-free positioning. This is a common question because a magnet makes it so much easier to attach the meter to a metal surface while you work. The truth is, FNIRSI designed their multimeters this way to … Read more

You plug a 200W device into your FNIRSI multimeter, and it reads 176W. This is not a broken meter. It is a normal result that matters because it affects how you test power supplies and batteries. The missing watts often come from power factor, internal resistance, or the meter’s measurement method. Your device might also … Read more

You bought a FNIRSI multimeter and noticed there is no magnet on the back. This is a common question for many DIYers and electricians who rely on hands-free meter placement. The magnet is often left out to keep the meter lightweight and reduce production costs. FNIRSI focuses on compact design, which means they sometimes skip … Read more

You have a FNIRSI multimeter that just sits there showing “Awaiting Auto Measurement” and never actually measures anything. This is frustrating because you need accurate readings now, not a screen that freezes on a waiting message. Many users do not realize this message often appears when the meter is stuck in a specific mode or … Read more

If your FNIRSI multimeter scope freezes and shows an old screen below the 50ms timebase setting, you are dealing with a known firmware limitation. This issue matters because it stops you from capturing fast signals correctly, which is frustrating when you need accurate readings for troubleshooting electronics. The root cause is that the internal processor … Read more

You turn on your FNIRSI multimeter, touch nothing, and see a high reading. This is confusing and makes you question if your tool is broken, which matters for accurate electrical work. This ghost reading is often normal, caused by the meter’s high sensitivity picking up stray electromagnetic fields in your home. A simple test with … Read more

You press the OK button on your FNIRSI multimeter and the screen flashes before going completely dead. This is a common and frustrating problem that can make your tool useless right when you need it. The flash often signals a sudden power interruption or a software crash inside the device. It is not always a … Read more