This equipment is Noise Category 3: Can be used at all hours. No limits.
Handle with care.
Dit is een precise instrument / This is a (precision) measurement tool with exact dimensions and straightness.
That means tapping it gently; but not hammering, using it as a crowbar and so on.
It is very important that if you accidentally drop it; or think it may be out of line - that you either mark the tool very clearly -- or report this to the mailing list. So that your fellow makers do not ruin their work.
We have several dial indicators in the metal woodshop. Consult http://www.mini-lathe.com/Measurement/Dial_indicators/Dial_indicators.htm or youtube for countless videos on how to use them. Or ask someone to show you.
I've you've never used these before (or are in doubt which one to use) then use the one in the big red box. It is the easiest and most versatile.
Red-armDirk-Willem van Gulik.