What is a laboratory cell counter?
A cell counter is a piece of equipment used to count the cells present in a biological sample, assess their viability, and obtain a precise cell concentration. It replaces manual counting on a hemocytometer for laboratories processing a high volume of samples, reducing analysis time and operator errors.
The technologies used vary depending on the model. Imaging counters capture an image of the cell suspension and automatically analyze each visible cell. Fluorescence counters detect specific markers to distinguish between cell populations. Electrical impedance analyzers measure the current variations generated by the passage of each cell through a capillary.
Each technology meets different needs in terms of analyzable cell types, precision, and throughput. The choice of equipment depends directly on the laboratory's protocols, the volume of samples processed, and the cellular parameters to be measured.
The different types of cell counters available
The Rewake collection covers the main families of cell counters used in laboratory and clinical settings. Each type meets specific application, throughput, and characterization level requirements. Identifying the right model from the start avoids selection errors and adaptation costs.
Available equipment ranges from compact benchtop counters for daily cell culture to multiparametric flow cytometers for advanced immunological analyses. The type of consumables required and the associated analysis software are determining criteria depending on the intended use.
Automated imaging cell counter
The automated imaging counter is the benchmark for cell culture laboratories. It analyzes a cell suspension through image capture and automatic processing: each cell is detected, counted, and characterized in a few seconds. Viability is measured by methylene blue exclusion, which penetrates only dead cells whose membrane is compromised.
This type of equipment uses single-use cassettes or slides depending on the model. Optical magnification and imaging resolution determine the counting precision for small cells or aggregates. It is also suitable for counting yeast and characterizing suspension cultures.
Fluorescence counter and flow cytometer
The fluorescence counter detects specific markers attached to cells to distinguish living populations from dead cells, or to identify specific cell subpopulations. The excitation and emission wavelengths are selected according to the fluorochromes used in the protocol.
The flow cytometer takes this logic further: it analyzes several parameters simultaneously on each suspended cell, at a rate of up to several thousand cells per second. It is essential for cell sorting, immunophenotyping, stem cell study, and advanced applications in hematology and immunology.
Hematology analyzer
The hematology analyzer is the benchmark equipment for counting blood cells: red blood cells, white blood cells, platelets, and leukocytes. It provides a complete blood count from a small volume of whole blood, with a throughput adapted to clinical laboratories.
The analyzed parameters include red blood cell count, hemoglobin concentration, mean platelet volume, and differential leukocyte count. These data are essential for diagnosing pathologies such as anemia, leukemia, or thrombocytopenia, as well as for moni
Technical criteria for choosing your cell counter
The first criterion is the detection technology: imaging, fluorescence, or impedance. Each technology has its advantages depending on the cell types to be analyzed, the complexity of the protocols, and the required level of characterization. An imaging counter is sufficient for most routine cell culture applications, whereas a flow cytometer is essential for multiparametric analyses.
The counting range and detection precision must be verified according to the cell density of the samples processed. Equipment with too narrow a range will require systematic dilutions, which lengthens protocols and introduces additional sources of error.
The type of consumables required, such as single-use cassettes or reusable slides, directly impacts the cost per analysis. The analysis software must allow for data export, protocol management, and ideally connection to the laboratory's information system.
The ease of sample preparation and the volume required per analysis are often determining practical criteria. Equipment requiring an overly large volume is unsuitable for work on rare cells or limited samples. The availability of spare parts and technical support completes the evaluation.
Rewake refurbished cell counters: our refurbishment process
Each cell counter integrated into the Rewake collection follows a structured refurbishment protocol, carried out by technicians specializing in biology equipment. The goal is to restore performance in accordance with original specifications, at a reduced acquisition cost.
The first step is a complete inspection of optical and mechanical components. The state of the optics, lenses, and light sources is systematically verified. Any source showing a degradation in intensity or emission spectrum is replaced before counting tests.
The detectors and fluidic path are then checked for any obstruction, leak, or signal drift. Calibration is performed on certified reference samples to verify counting precision and the reliability of the cell viability measurement.
The analysis software is tested on all its functions: counting, viability, data export, and protocol management. Each piece of equipment shipped is accompanied by a warranty and complete traceability, including values measured during validation tests.
For which uses and sectors?
Cell counters in the Rewake collection cover a wide spectrum of professional applications. In cell biology, they are used daily for culture monitoring, checking cell density before passaging or seeding, and evaluating viability after treatment.
In clinical hematology, hematology analyzers allow for complete blood counts for the diagnosis and monitoring of pathologies such as anemia, leukemias, or coagulation disorders. Throughput and result reliability are non-negotiable criteria here.
Immunology and stem cell research laboratories use flow cytometers for immunophenotyping, cell sorting, and the study of hematopoietic populations. These applications require rigorous calibration and complete traceability of acquisition data.
The pharmaceutical and biotechnology industries use this equipment for monitoring cell production processes and evaluating the cytotoxicity of candidate molecules. The dairy industry uses specialized counters to measure somatic cells in milk, a key indicator of herd mammary health.
Why choose a refurbished cell counter?
The main argument is economic. A refurbished cell counter is available at a significantly lower price than equivalent new equipment. For laboratories equipping multiple workstations or looking to renew equipment at the end of the manufacturer's warranty, it is a concrete lever for cost reduction without compromising result precision.
The major brands of biological instrumentation are represented in the Rewake collection. Accessing counters recognized for their reliability and precision, at a controlled cost, is a direct advantage for teams subject to strict protocols and high reproducibility requirements.
Delivery times are generally shorter than for new orders, as the equipment is available in stock and ready to ship. An urgent replacement or a rapid expansion of analytical capacity thus becomes possible without immobilizing a large investment budget.
From an environmental perspective, extending the lifespan of laboratory equipment reduces manufacturing needs and limits electronic waste. Refurbishment is part of a responsible resource counting approach, without harming the operational quality of the delivered equipment.
Request a quote for a laboratory cell counter
Rewake offers refurbished manual and automated cell counters for biology and cell culture applications. Request your quote for a laboratory cell counter based on your samples and analysis rate.
FAQ — Refurbished cell counter
What is the difference between an automated cell counter and manual counting on a hemocytometer?
Manual counting on a hemocytometer relies on the optical microscope observation of a cell suspension placed under a slide, within a reference grid. It is precise but slow, operator-dependent, and unsuitable for large volumes of analyses. The automated counter processes the same data in seconds, with statistically superior reproducibility. The choice depends on the required analysis throughput and the laboratory's traceability requirements.
Can a cell counter distinguish living cells from dead cells?
Yes. Most modern counters measure cell viability by excluding a dye such as methylene blue or propidium iodide. Dead cells, whose plasma membrane is compromised, absorb the dye, unlike living cells whose membrane is intact. This viability measurement function is systematically verified and validated during the refurbishment of each Rewake piece of equipment.
Are Rewake refurbished cell counters reliable for research applications?
Each counter is calibrated on reference samples and tested on all its counting and viability functions before shipment. The measured values are compared to the original specifications. Calibration and test reports are available upon request for laboratories subject to traceability or accreditation requirements.
What consumables are required for an automated cell counter?
Depending on the technology, the consumables are single-use cassettes, slides, or dye reagents. The availability and cost of these consumables are criteria to be integrated right from the equipment selection stage, as they determine the actual cost per analysis over time. The Rewake team can guide you toward supply sources compatible with the collection's models.
What maintenance is required for a laboratory cell counter?
Regular maintenance focuses on four points: cleaning the optics and the fluidic path after each series of analyses, periodic verification of calibration on reference samples, updating the analysis software, and replacing light sources according to the manufacturer's recommendations. Rigorous maintenance is essential to maintain counting precision and the reliability of viability measurements over time.
