Cartridge CheckUp - Heerbrugg Microscope

My frind Chris procured this amazing cartridge microscope. The lighting rig is key. I found that most of my cartridges are heavily used and need to be replaced. I have a few Klipsch cartridges with some life on them and now I have the step up transformer to go with them… If anyone has cartridge recommendations for a high mass Jelco 12” tonearm please let me know. I believe it wants a low compliance cartridge.. BTW the cart pics are with an iphone through the eyepiece. Impossible to get a great pic…