Verdict: choose the Countess 3 for fast, dedicated high-throughput viability counts. Choose the EVOS M5000 when you also need four-channel fluorescence imaging, Z-stacking, time-lapse, confluence analysis and publication-quality export. Both are available from Thermo Fisher Scientific UK.
Head-to-Head Comparison Table
| Feature | EVOS M5000 | Countess 3 |
|---|---|---|
| Primary role | Fluorescence imaging + counting | Dedicated automated cell counter |
| Count time | ~30–60 s per field | ~10 s per sample |
| Fluorescence channels | 4-colour LED (DAPI, GFP, RFP, Cy5) | Optional dual (Countess 3 FL) |
| Z-stacking | Yes | No |
| Time-lapse | Yes | No |
| Confluence analysis | Yes | No |
| Publication images | Yes — high-resolution export | Result image only |
| Footprint | Larger benchtop unit | Compact benchtop |
| Best for | Research labs needing images + counts | High-throughput routine counting |
Why Choose the EVOS M5000
- Four-colour LED fluorescence for GFP, RFP, DAPI and Cy5 workflows
- Z-stacking and time-lapse for live-cell and 3D assays
- Built-in confluence and automated cell counting software
- Publication-quality image capture and annotation
- Same UK service path as Countess and CellInsight systems
Why Choose the Countess 3
- Fastest counts in the Thermo range — ~10 seconds per sample
- Compact footprint ideal for crowded tissue-culture rooms
- Touchscreen workflow with minimal training
- Optional Countess 3 FL upgrade for fluorescence viability
- Lower running cost for pure counting workloads
Frequently Asked Questions
Is the EVOS M5000 better than the Countess 3 for cell counting?
The EVOS M5000 is better if you need fluorescence imaging, Z-stacking, time-lapse, confluence analysis and publication-quality images alongside counting. The Countess 3 is better if you only need fast, high-throughput viability counts and want the smallest footprint and lowest running cost.
Can the Countess 3 capture images like the EVOS M5000?
The Countess 3 captures brightfield images for counting and can store result images, but it is not a research microscope. It does not offer multi-channel fluorescence, Z-stacking, time-lapse or the large-field imaging capabilities of the EVOS M5000.
Do both systems share the same UK service organisation?
Yes. Thermo Fisher Scientific UK supports both the EVOS M5000 and Countess 3 families, so labs using both instruments can combine training, service and support under one UK contract.
Related UK Guides
- Best Automated Cell Counting Microscope UK 2026 — full comparison of all systems
- Countess 3 vs LUNA-III UK — dedicated counter comparison
- Free Automated Cell Counter Buying Checklist — printable comparison sheet