From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 02/07/01-11:53:07 AM Z
Here's a way to turn an inexpensive dropper into an accurate pipette for
measuring out coating solutions.
This works best for glass droppers and may be more accurate than using
plastic.
Materials:
+ droppers
+ a small calibrated syringe (1 ml, accurate to .01 ml, most drug stores
have these)
+ masking tape
+ chemical resistant white epoxy paint
+ distilled water
Instructions to calibrate:
+ determine the amount required to be dispensed
+ fill syringe to desired amount with distilled water (distilled is used
so as not to contaminate the dropper.)
+ remove bulb from dropper
+ placing finger over narrow end of dropper and holding with large end
up, fill with measured syringe contents
+ place masking tape on dropper so that edge is at the level of the
water and the tape covers the water filled portion.
+ release water from dropper
+ mark a line on the dropper at the tape edge using the epoxy paint
+ remove tape and let paint dry
Instructions to Use:
+ fill dropper with solution to just above paint line
+ then empty some solution back so that the top of the solution is at
the top of the paint line
+ empty entire dropper into destination
The delivery might be slightly less due to solution sticking to the
dropper surface, but should be very consistent.
Each dropper has been marked to deliver the precise desired amount of
solution. A dropper could even have several marks.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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