Multimeters

FNIRSI FNB58 vs FNIRSI FNB-C2: Best USB Power Meter for Fast Charging? I’ve been testing two of FNIRSI’s most popular USB power meters side by side: the FNB58 (4-28V / 7A) and the newer FNB-C2 (4-50V / 6.5A / 240W PD 3.1). Both measure voltage, current, and fast-charge protocols, but they target very different users. … Read more

If you have an FNIRSI multimeter and are trying to adjust the sweep trigger level, the process can feel confusing. This setting is important for catching fast signals, but the menu layout is not as simple as on other tools. The main issue is that the trigger function is often buried inside a secondary mode, … Read more

You rely on your FNIRSI multimeter all day, and a dead battery stops work cold. Knowing if the built-in rechargeable battery lasts through a full shift is essential for staying productive and avoiding frustration. From my experience, most FNIRSI models easily handle 8 to 10 hours of normal use on a single charge. This means … Read more

FNIRSI DSO-TC3 vs FNIRSI DSO152: Best Oscilloscope & Transistor Tester for DIY Electronics? I’ve been testing two popular FNIRSI handhelds side-by-side: the DSO-TC3, which packs an oscilloscope, signal generator, and transistor tester into one box, and the simpler DSO152, a dedicated 200kHz bandwidth pocket scope. The DSO-TC3 boasts a 500kHz bandwidth and 10MSa/s sampling rate, … Read more

Why is there no knob to smoothly vary the timebase on my FNIRSI Multimeter? This is a common question from users who expect a traditional analog feel. It matters because the timebase controls how you view waveforms, and a knob seems intuitive for smooth adjustments. The reality is that FNIRSI uses digital step controls for … Read more

You bought an FNIRSI multimeter and expected a temperature probe in the box. It is frustrating when a tool seems incomplete for basic electrical and thermal testing. Most multimeters in this price range focus on core voltage and resistance measurements. Including a temperature probe would raise the cost for users who never need that feature. … Read more

You might have noticed the numbers on your FNIRSI multimeter screen are hard to read. This happens because the low resolution display cannot show fine details clearly, making precise measurements difficult to see. A low resolution screen means fewer pixels are available to form each digit and decimal point. This often causes small voltage or … Read more

That little rubber flap on the FNIRSI multimeter is meant to keep dust out of the USB port. It can be a real pain to open, and many people worry about breaking it off completely. I have found that trying to pry it up with a fingernail often fails. A better trick is to use … Read more

When you are testing temperature with your FNIRSI multimeter, you might notice the display only shows whole degrees. This can feel confusing, especially if you expect more decimal places for precision. In my experience, this 1-degree precision is actually standard for most handheld multimeters. The internal temperature sensor is designed for general troubleshooting, not laboratory-grade … Read more

You might wonder why your FNIRSI multimeter is not designed for high energy circuits. This matters because using the wrong tool on powerful systems can be dangerous for you and your equipment. High energy circuits, like those in industrial panels, can create dangerous arc flashes. Most FNIRSI meters lack the necessary safety ratings and fusing … Read more