[qldbureau]

Is your replacement another FO or clone thereof or another type and make altogether?

I am not certain about my replacement, though I suspect they are clones. Both were listed as replacement parts for the FO series. My first set arrived in small boxes with no markings, yet my replacement gauge I sourced from another supplier; which I paid marginally more for arrived without its own box. This one appears to be a better build quality inside, particularly with how the magnet tip is placed and exposed.

It will be interesting to see your test results.