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Treehugger
Ok, I should explain how it works on the HiPER app.
Basically, any number you type into the calculator at once, if you press the 'CONV' button there's a menu that gives you a list of possible options, so you would choose 'millimeters', THEN AFTER THAT, the screen shows associated measurements in various standards, like inch and feet and who knows what else, lots of this stuff.

If you needed to change your initial imput, this number you typed in at the start, you can simply edit your existing number from the conversion screen on top, and the calculator immediately recalculates the other conversion numbers numbers.

Bruno
Me neither, cannot find anything about it.