Help me find a modern use for this tool

[Toolmaker51]

Mklotz and C-Bag...
Planer gauges represent a desired height, typically before the work piece is mounted. It prevents tools impacting material; instead of trying to eyeball tool path. Works in milling machines or surface grinders now, as well in planers and shapers decades ago. The incline's purpose is to allow settings in very small increments. A height gauge is used primarily; or, compared to gauge blocks with indicator, measured with micrometer, calipers etc. The expense now is usually because others are +$ too. Those opportunists scoop toolboxes at garage sales, wire brush the s__t out of it, surf ebay for like items, and slap on price tags. They're easy to spot. The description lack detail, wrong, general tripe, 'need help identifying' etc.
Sure! Where's my percentage for critical info?

Not exactly a machinist jack; but inspectors will use them in a similar manner, i.e. testing an unknown angle, with a sine bar. The incline is not steep enough to descend on it's own. They'll tap it down while traversing the part [on sine bar] with an indicator. The nicest have a fine-adjustment screw too. At evident zero, [representing hypotenuse] lock the planer gauge clamp. Measure gauge height for [side opposite] in solution of angle. Hundreds [?] of times easier than exchanging jo-blocks, feeler gauges, or the like.

So there's more. I smell a new thread. We don't charge for that here.