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Specifications:
| Application | Cell Analysis |
| Storage Temperature | Room Temperature |
| Product Type | Glass slide |
| Product Brand | Thermo Fisher Scientific™, Invitrogen |
| Product Grade | Molecular Biology |
The Invitrogen™ Countess™ 3 Standard Slide is a ready-to-use, reusable reference slide designed to verify the accuracy and consistency of cell counting, viability, and fluorescence detection on Countess automated cell counters. Preloaded with immobilized microspheres, the slide mimics a mixed population of live and dead cells, providing a stable and consistent sample for routine instrument performance validation.
Compatible with Countess II, II FL, Countess 3, and 3 FL models, the standard slide supports both brightfield and fluorescence cell counting. Its dual-fluorescent bead populations offer validation across a broad emission spectrum (UV to far red), making it ideal for labs performing fluorescent viability and counting workflows.
Key Features
- Preloaded, ready-to-use reference slide—no prep or staining required
- Contains 15 µm immobilized microspheres at a stable concentration of 0.5–1.5 × 10⁶ beads/mL
- Mimics brightfield cell populations (1:1 live/dead mix with trypan blue)
- Includes dual fluorescent bead populations visible across DAPI, GFP, RFP, Texas Red, and Cy5 channels
- Reusable—ideal for daily instrument QC and demonstration of Countess features
- Enables routine performance verification and inter-instrument consistency checks
- Designed for use across Countess platforms with brightfield and fluorescence capabilities
Specifications
| Property | Detail |
|---|---|
| Slide Type | Reusable Standard Slide |
| Microsphere Size | 15 µm |
| Bead Concentration | 0.5–1.5 × 10⁶ beads/mL |
| Optical Compatibility | Brightfield and Fluorescence (DAPI, GFP, RFP, Cy5) |
| Instrument Compatibility | Countess II, II FL, Countess 3, Countess 3 FL |
| Light Sources | UV, Blue/Green, Red |
| Application | Cell counting, viability, and fluorescence calibration |
| Reusability | Yes |
| Packaging | 1 Slide per unit |
| Storage Conditions | Ambient |
| Warranty | 1 Year from date of purchase |
| Intended Use | Research use only |
Applications
- Routine instrument calibration and performance checks
- Training or demonstration of Countess counter operation
- Fluorescence and brightfield cell count verification
- Cross-instrument reproducibility checks in core labs
- Troubleshooting and quality control in automated counting workflows
The Countess™ 3 Standard Slide is an essential calibration and training tool for labs using Countess automated cell counters. With its permanently mounted microspheres, it provides consistent and repeatable references for both brightfield and fluorescence-based cell counting, helping researchers ensure accuracy and reliability in every run. Whether for QC, demo, or training, it supports precision in routine viability assessment and high-throughput cell culture monitoring.