N-scale magnetic uncouplers

Two quick questions. I remember seeing a hand-held uncoupler that opened Micro-Trains couplers using a magnet. This seems a better choice than hand-held that mechanically uncoupled. Does anyone know who makes this?
Second, I purchased a couple of coupler conversion kits for Kato Beth-gon coal cars. Any experience with these. As always - thanks for the knowledge.

http://www.rixproducts.com/6280014.htm

Is this it? I don’t see why it would not work for N