You might look at your probe first. Switching from 10:1 to 1:1 might get you down to 2mv

And if Frogman’s suggestion doesn’t work then a far cheaper alternative then buying another scope is to build the stand alone version of the SIFT tester. That one does not need a scope at all:

PS: if you ever decided to build the stand alone version theb relevand video number for it are : 45, 46, 47 and 48 . I hope I’m right :)))

@ovi4 thanks I’ll check out the probe and videos

Posted by: @jodonne22

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I have a question on Mr. c’s test method for finding the foil side of capacitor using a oscilloscope. My scope does not go down to 2mv , it only goes to 20mv . is there any easy work around or do I need to purchase a better scope?  thanks for any advice.

@tapiot I can’t find it on the Patreon videos, but you can find it on YouTube by searching

Are Your Capacitors Installed Backwards? Build this and find out. 

videos 45 – 49 are for the Capacitor leakage tester not the outside foil tester. I’m on my third try and I can’t get it to work. Good Luck

@jeffprojectbench it is true that videos 45 to 49 are indeed for the Cap Leak Tester.  On my other post above I claimed it to be for the cap foil side tester (SIFT)  but by the time I realised (I have just published a misleading info) it was far too late as if you ever make a mistake in your post and want to edit/modify it  to correct it,  once you have published it, you only have a maximum of  2 minutes window to do it. After that time, it gets locked and the edit function is no longer available . Unfortunately. 😶

@tapiot Success! I found the outside foil tester, it is video #28. The video descriptions are not very descriptive.

@ovi4 Success! I found the outside foil tester it is video #28. The video descriptions are very not very descriptive. Thanks for the editing advice.