Thermo Invitrogen Countess II

Item: 1754C COUNTER


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Thermo Scientific Invitrogen Countess II Automated Cell Counter

  • 7” Touchscreen display
  • Brightfield only
  • Results in as little as 10 seconds
  • 90-day warranty

The Invitrogen Countess II Automated Cell Counters contain advanced autofocusing and counting algorithms to allow you to quickly and accurately count cells, while avoiding user variation associated with counting. They offer autofocus and auto-lighting minimize user-to-user variability, and built-in dilution calculator and ability to save up to 10 user profiles.

The Countess II Automated Cell Counter takes 10 seconds per sample for a typical cell count and is compatible with a wide variety of eukaryotic cells. In addition to cell count and viability, the instrument also provides information on cell size.

The autofocus feature of Countess II instruments works by analyzing more than 30 focal planes, then selecting the plane with the best focal quality. This helps ensure that any variance from sample to sample, user to user, and slide to slide is minimized. Results are based on the optimal focal plane to enable highly accurate cell and viability counts.

The ability of the Countess II cell counters to gate cells based on cell size, brightness, and circularity using quantitative measurements rather than operator judgment also helps to reduce subjectivity, and allows increased repeatability between samples and users.

The additional time it takes to manually count cells compared to counting with the Countess II Automated Cell Counters is often overlooked as an added cost. An individual counting five slides per day (two samples per slide) can save ~10 hours per month by switching to an automated counter with a reusable slide. This additional time can be applied to other activities in the lab, resulting in a significant advantage when switching from manual to automated cell counting.

Easily determine the amount of cell sample and buffer needed for your experiment with the built-in dilution calculator. The cell count results are automatically used in the calculation; simply input the desired concentration and the volume needed.

Objects of ~4–60 μm can be counted. Cells of ~7–60 μm can be counted and assessed for viability. The Countess II instruments are designed to read samples with concentrations in the range of 1 x 104 cells/mL to 1 x 107 cells/mL. The count-to-count variability with the Countess II instruments is less than 10%.

All of our equipment is used and reconditioned. Our technicians test all equipment to confirm that it operates properly and to the manufacturer’s specifications. While we can’t test for a specific analytical application, we will do our best to simulate the conditions under which the equipment will be run. If you have particular testing requirements or requests please let us know and we’ll work with you to make sure these requirements are addressed during testing.

The photos above are representative. Please bear in mind that the equipment shown is currently in storage in our warehouse and that in addition to testing each machine we will clean all the equipment thoroughly prior to shipment. We often have multiple units of each model in stock and sometimes we're unable to feature photos of every single unit. At your request, we can provide photos of the equipment in your order after it has been tested and cleaned.

Thermo Scientific Invitrogen Countess II Automated Cell Counter – Specifications

Optics - Brightfield only

Slides - Countess Cell Counting Chamber Slides (disposable)

Processing time - As little as 10 seconds

Required sample volume - 10 μL

Sample concentration range - 1 x 104–1 x 107 cells/mL

Particle and cell diameter range - Particles: ~4–60 μm; cell diameter: ~7–60 μm

Objective - 2.5x

Total magnification ~55x

Illumination - LED (50,000 hours)

Camera - 5 megapixels


Instrument dimensions - (W x D x H) 9 x 5.5 x 9 in.; 23 x 14 x 23 mm

Weight - 8 lb

Operating power - 100–240 VAC, 0.58 A max.

Frequency - 50/60 Hz

Electrical input - 12 V DC, 2 A

For inquiries about the Invitrogen Countess II, please give us a call at 978-521-2221, or fill out the form on this page.