I got the colony counter from scienceware (F37862-0000) if you actually
need to keep  a running count of your dots.  More expensive than a
marker but it prevents cramped thumbs from the bus driver clickers we
had before.
Sylvia 

Sylvia P. Poulos
USDA-ARS-Animal Physiology Research Unit
Athens, GA 30605
706-583-8279
706-542-0399 (fax)

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