A cell counter that thinks like a cell biologist

Thermo Fisher Scientific offers two high-performance, automated cell counters designed to meet the needs of any lab for accurate and precise cell counting without the drudgery, wasted time, subjectivity, and variability of manual hemocytometer counting. Developed by expert cell biologists with the aid of artificial intelligence, the Invitrogen Countess 3 and Countess 3 FL instruments are almost a paradox: automated cell counters that think like a cell biologist.


Countess 3 Automated Cell Counters provide highly accurate and precise brightfield and fluorescence cell counts even for challenging cell sample types. Automated features like rapid capture, autosave, and built-in calculators add convenience and time savings. Whether you’ve been counting cells manually or using an early-generation automated counter, the Countess 3 cell counters represent a significant upgrade in counting accuracy and workflow efficiency.


Don’t doubt the count

Algorithms developed by cell biologists and refined using artificial intelligence offer the accuracy of hemocytometer counts and the precision of flow cytometer counts—without the expense or training required by flow cytometry.

3D Interactive Virtual Tour

Interact with a virtual Countess instrument to experience its usability.


Rich fluorescence applications

Go beyond simple counting to advanced viability, apoptosis, transfection efficiency, fluorescent protein expression, and more with the Countess 3 FL Automated Cell Counter.

Fast counting for safety

Get in and out of the cell culture lab quickly to avoid crowded, busy labs and transmission of infectious diseases. The touchscreen is flush with the console and easy to disinfect. Many automated features enable fast cell counts so cell culture work can be completed more quickly.

Go green

Compatible with both convenient disposable slides and the environmentally friendly, economical Countess Reusable Slide.

Convince your lab

Tired of the tedium? View the video (0:34), send the letter, and sign the petition to convince your lab to put an end to manual cell counting forever.

For Research Use Only. Not for use in diagnostic procedures.