That’s harsh. If I’m not wrong that’s Nikon Immersol Oil - & (personally) I think the Nikon dropper is too large & always dispenses too much oil.
The Zeiss plastic flat spatula dropper is much more user friendly.
BTW I absolutely applaud the fact that you’re teaching proper addition of immersion media to lenses (I’m assuming you also teach how to clean the lenses as well).
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The Zeiss plastic flat spatula dropper is much more user friendly.