I only saw one trimmer in there, none on the outside. Touch the leads together and the thing hunts around from double-digits down to about 3-8 ohms if I press the leads together and hold them real steady.
I've owned meters before and never saw anything this bad.
And I got the name wrong, it's Cen-Tech. Here's the miscreant and the price has dropped but it's still not worth it:
It's going to meet my soldering iron, solder sucker and cutters some day. Till then it's in the junk parts bin.
There's a lot of junk there but also some good deals here and there. Got my "helping hands" magnifier with gator clips arms there for $3. The magnifier is actual glass and doesn't distort. The base is heavy cast iron. I couldn't do much with the UNO without the thing, can't see close enough to get a jumper in the right hole with just my glasses.