I opened my new FNIRSI multimeter and found a sealed battery compartment with no way to swap the cells myself. That frustrated me, because I expected a simple battery door like every other meter I have owned. The truth is modern sealed batteries allow for a thinner, waterproof case that protects sensitive electronics from dust … Read more

The FNIRSI multimeter you own likely cannot measure 28V from PD3.1 chargers because its hardware is designed for older USB Power Delivery standards. This is a common frustration for people trying to test new fast-charging laptops or power banks. PD3.1 introduced a new 28V fixed voltage, which requires specialized circuitry to negotiate and measure safely. … Read more

I picked up my new FNIRSI multimeter excited to test it, but the menus were all in Chinese. Figuring out how to switch them to English took me a full hour of frustration. The process was hidden deep in the settings, and the icons were not intuitive at all. I finally found the language option … Read more

You bought an FNIRSI multimeter that claims 9999 counts for True RMS readings. But the numbers you see on the screen do not match real-world tests. This matters because you rely on your meter for accurate work. The 9999 ticks promise is misleading because the internal ADC chip only has 6000 counts of genuine resolution. … Read more

You see your FNIRSI multimeter showing 11.9 Vp-p when you know your sine wave should be 10 Vp-p. This difference can confuse you and make you question your equipment’s accuracy. This reading is important for getting reliable measurements in your projects. Your meter likely measures peak-to-peak voltage differently than you expect. Many multimeters, including some … Read more

I bought my FNIRSI multimeter hoping it would save money over a Fluke. It worked fine at home, but in a professional shop, it started acting flaky. The plastic housing cracked from a small drop, and the readings drifted. A professional meter needs to survive daily abuse, and my FNIRSI just was not built for … Read more

When you notice your FNIRSI multimeter only offers coarse timebase adjustment, it can feel limiting. Why this design choice exists helps you use your meter more effectively for basic frequency measurements. Many budget-friendly multimeters, including some FNIRSI models, prioritize simplicity and cost over fine control. A coarse adjustment is often sufficient for checking if a … Read more

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