Fnirsi HRM-10 Internal Resistance Tester 

By doing this the resistance of the probe cables is still not being measured, but the resistance of the tube and extra contact point will be measured. From the video it seems to be low enough, but I would prefer to use a plastic or foam insulator between the probe contacts to keep them apart and use them directly.

Yeah, for some reason that doesn't work. If you just touch the closed probes onto the ends of a cell, the resistance reading is too high and very unstable.

Or for find shorts on PCB's

It wasn't exactly the same, there was about 10 millivolts of difference, which is relevant when it's supposed to measure to an accuracy of 0.1 millivolts. It would be like using meters that measure to the nearest volt, and one reads 3 volts but the other reads 103 volts. Quite a big difference given the precision it's supposed to have.

It's an Aarontek 30MHz, but there are dozens of small handheld scopes available now.

I've just checked a magnet - it's resistance is about 1.5mohm - quite a bit higher than the copper tube which was about 0.03mohm. Also, soldering to a magnet is problematic - heat damages the magnet.

@@JulianIlett it was worth a try! Thanks, Julian. I would think a battery holder would work

@@andyshap Clipping the Kelvin Clips to an 18650 battery holder seemed like the obvious solution as soon as the 'problem' was raised.

Thanks foe the review. Have you check its accuracy? Planning to buy this for lion batts ang capacitor Internal resistance test job.

How would you repair something with a microcontroller in it that has embedded, locked, flash? You can read the chip number and replace it, but without the firmware it still won't function. So having chip numbers on it probably won't help with repairability. Scraping numbers off the chips is only done so they can use factory seconds destined for the rubbish and not get caught by the company that paid to have the chips fabricated, it's not done to hide anything from the buyer.

@@vink6163 but they erase markings even on opamps, I dont care for their reasons, I'm not bying fnirsi and simmilar e waste anymore.

@@vink6163 RU-vid keep deleting my comments, why scrub numbers on opamp? Just no

@@vink6163 so why from op amp

@@craigtucker777 It probably didn't meet the specifications, or the batch was found to fail early, or had some other problem so the company didn't want it released with their brand name on it, so they told the factory to destroy them. But many Chinese factories just scrape the numbers off and sell them cheap for low-cost products where either they don't care if it breaks, or the problem with the component doesn't matter. The companies making the chips don't like it because it means people aren't buying their proper chips and they're not getting royalties, but it seems to be difficult to stop it from happening.