FNIRSI DSO152 Mini Digital Handheld Oscilloscope Kit – Portable Pocket FNIRSI Oscilloscope, 1 Channel Automotive Scope, 2.8" TFT, 2.5MS/s, 200KHz Bandwidth, Auto Trigger

This thing is my first scope, so bear that in mind. But I love this thing. It's so small. The screen is about 2" tall and 2.5" wide, seriously. That said, the display is plenty easy to read if you your vision is decent. The controls take a bit of figuring out, but for basic circuit design, it's plenty functional. The only flaw I've discovered so far is that the screen freezes for about a second or two from time to time. That, and to use the full 400V range, you need to pick up a probe with 10x that uses this kind of connector.

this when paired with a X10 probe is great for quick measurments. i use it in audio to test output signals. it also works for higher freqency switching for internal amp repair.its battery powered so isolated from ground which is greatthe buttons work well, easy to navigate. the adapter for the BNC probe is pricy but aliexpress has them for cheaper - that helps.the only issue i have found is the P2P voltage limits are slightly smaller than advertised. i have a dso diy build it yourself scope that should in theory be the same as this but it has greater capacity before overloading. that is to say that i can go to 80v ac on my other scope where as this one goes off the screen at around 51vwhen tested against my keysight bench scope this has much more ripple in its measurments, it has no smoothing that i can tell, and its trigger is at times - more hunting than i would like. in the middle of a measurment it will jsut loose itself and throw the wave forum all over the screen.for the price id say this is a GREAT scope for portable work. its about twice hte price of the DIY DSO but you dont need to assemble anything,, dont need to build a battery controller and all that. this is turnkey.

Sample rate could be a little quicker but all-in-all, it’s a handy device.

I was very skeptical about there being a $35-$45 DSO available on the market. I’ve been a Certified Master Automotive Technician (CMAT) for about 7 years and have been diagnosing using scopes to diagnose vehicles for even longer. I am used to using scopes that sell for thousands of dollars (Snap-On, Pico, etc). So when I saw this at $36 I was skeptical but not so much that I didn’t buy it.I bought it because I recently switched to being a mobile mechanic, which means you have to have everything with you. Lugging around a 4-channel scope and all the equipment adds space requirements. If I can opt to just have a small single-channel scope kit with me I’ll do it - as long as it serves its purpose.So I have had the opportunity to use it once already. I had a 2011 Infiniti G37 that was setting a camshaft position sensor code. I was able to use this DSO152 to verify the sensor was producing a reliable signal which then helped me find a wiring problem. I was astounded that something that costs $35 could help me do that.All that being said:Pros: small, cheap, good battery life, easy controls, good instruction manual, accurate waveform specs on screen, good plastic body, really good “auto” feature that will find the best settings to analyze a waveform.Cons: uses a very small BNC connector so you’ll need adapters (one is included), cannot save images - only pause, you can’t zoom in or out on a paused image, the trigger function is decent but it doesn’t allow horizontal adjustment - only vertical.

Upon turning this meter on and testing it. It locked up. I tried restarting it and nothing happened. I had to let the battery get exhausted. Decided to return it and go another route.