Ortofon Rondo Red stylus weight

I recently bought the magnificent Ortofon Rondo Red.
Do you know if its stylus weight can be adjusted using the Shure SFG-2 which is made from metal ?
A friend told me that the Rondo ,being MC, will alter the weight reading due to its coil.

Same question about this gauge:
Can it be used with an MC cartridge like the rondo?

The plastic Ortofon gauge I recently bought ended being a crap that due to its bad machining has friction that shows no difference between 1.5gr and 3gr.

Please advise...