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Invitrogen™ Countess™ 3 Standard Slide

The Invitrogen Countess 3 Standard Slide is optimized for both brightfield and fluorescent counting applications when using Countess II, Countess II FL, Countess 3, or Countess 3 FL automated cell counters.

Supplier:  Invitrogen™ A51876


Catalog No. A51876

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The Countess 3 Standard Slide contains a unique, inert, immobilized bead mixture that mimics the staining pattern of live and dead cells stained with trypan blue under brightfield illumination (the most common cell counting analysis method).

The Countess 3 Standard Slide offers further utility by containing two populations of fluorescent beads that cover the fluorescent spectrum from blue to far red, thereby allowing analysis with a variety of EVOS light cube combinations available to Countess II FL and Countess 3 FL users.

  • Accurate—helps eliminate the error involved in creating standard solutions and dilution series
  • Flexible—optimized for use in both Countess II, Countess II FL, Countess 3, and Countess 3 FL automated cell counters
  • Fast—supplied as a pre-loaded, immobilized, bead suspension; no mixing required
  • Convenient—one standard slide for brightfield and fluorescent counting applications

Count confidently

The Countess 3 Standard Slide is supplied ready-to-use and does not require any special handling or sample preparation, thus eliminating the major source of count-to-count variability. Repeatable counts are easily achieved over the life of the slide, with variability only encountered upon changing instrument gating settings, which is very common in multi-user laboratories.



Countess II, II FL, Countess 3, and 3 FL
Brightfield & Fluorescence
0.5 to 1.5 million beads/mL
UV and Blue/Green and Red
1 slide stored at ambient conditions.
1 Year from date of purchase


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