Why is one listed for $11 and two pack $75? Am I missing something or was that a typo?

Just buy 2 at the $11 each price.

Is it adjustable? Does it have something on the upper end to tighten it?

its .200 on the small end,.400 on the large. you use it by chucking up the larger end into either a collet or drill chuck,turn on the spindle and touch it to the edge of the workpiece until the wobble or runout runs true,then zero out your readouts or set dial to zero,then move negitive .100 which is half of .200 and that puts the spindle dead on the edge of the workpiece,then you can calculate any machining off of that

What is the safe max RPM rating for this edge finder?

They are designed to run roughly 1400 rpms, this has to do with the spring tension etc. I wouldn't go faster than 2000. After that the spring expands and can become inaccurate. Much faster than that and they can explode.... don't ask how I know.

Manufacturer	Mitutoyo
Part number	050101
Item Weight	0.28 g
Product Dimensions	9.91 x 3.56 x 1.27 cm; 0.28 g
Item model number	50101
Size	1-(Pack)
Finish	Unfinished
Material	Steel
Shape	Round
Item Package Quantity	1
Measurement System	Inch
Batteries Included?	No
Batteries Required?	No

Mitutoyo050101, Edge Finder, 3/8" Dia. Shank.200" Dia. Tip

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