Ok, got my
$30 Shore Type-D durometer from Amazon, and to my surprise it's a well-built, functional tool. Very consistent readings (within 1-2 points every time on the same tip), and gave an expected range of hardness readings across a variety of tips. I measured all the tips I have on hand, and listed the avg reading below.
From this limited assortment, I'd have to say
the stock Rhino tips in Medium are closer to a Soft, unless they firm up significantly with play. (I wish I had an unplayed Kamui Black Soft on hand to test).
From softest to hardest
Rhino Crystal Medium - mounted, cut down, shaped, unplayed: 66.5
Rhino Crystal Medium - unmounted and unshaped: 66
Pooldawg Milk Dud - unmounted: 71
Kamui Clear Black Soft - cut 2 layers off, mounted, and heavy play: 74
Pooldawg Milk Dud - mounted and medium play: 75
Taom v2.0 Break/Jump tip - mounted and medium play: 86
Samsara break tip - mounted and medium play: 87
Phenolic Jump tip - came stock on Pechauer jump cue: 91
Pics of the durometer in action - simply press it down firmly into tip until base is flush. The Type-D conical probe is sharp on the end, vs Type-A which is rounded and made for softer materials (accd to my research, Type-D is most common type used for tips - see similar results with a $350 type-D bench-mount durometer at
https://billiards.colostate.edu/faq/cue-tip/hardness/chart/).
Kamui Clear Black Soft:
View attachment 737618
Rhino Crystal Medium:
View attachment 737630