there are a bunch of inexpensive handheld oscilloscope on the market for many years, some with terrible reviews, other with spotty reviews or spotty software to non existent customer service.
Has anyone used one of these such as FNIRSI, Hanmatek, Hantek, any price from $40 to high $100. The on-line jungle vendors have plenty to offer.
I am always messing up with various vehicle and my USB picoscope is useful with a 25Mhz, the secondary scope is not the best, it still needs a laptop, not the most practical for a road side quick check. The handheld claims seems to fit the bill in the 50 to 100Mhz.
Thank you for your ideas, happy turkey day