With the option for fluorescence capabilities brightfield and two user changeable fluorescence channels the invitrogen countess ii fl automated cell counter can count cells monitor fluorescent protein expression and measure cell viability in as little as 10 seconds. Any researcher who works in a cell culture hood needs some sort of cell counting solution whether to determine cell concentration prior to cell passage or to assess cell viability following drug treatment. The time it takes to manually count cells using a hemocytometer up to 5 minutes compared to counting with the countess ii automated cell counters 10 seconds is often overlooked as an added cost.
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