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Liofilchem™ McFarland Densitometer, Den-1B
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Measurement range 0.00–15.00 McF
Measurement wavelength (λ) λ = 565 ±15 nm
Sample volume: not less than 2 ml
Tube external diameter: 12 mm, 16 mm
Specifications:
| Application | Microbiology, Microbial Identification/AST | Warranty | 1 Year |
| Storage Temperature | Room Temperature | ||
| Product Type | Laboratory Equipment | ||
| Product Brand | Liofilchem | ||
| Product Grade | Microbiology grade | ||
Liofilchem™ McFarland Densitometer, Den-1B is a compact digital densitometer designed for measuring the turbidity of microbial cell suspensions in McFarland units. It is suitable for routine microbiology workflows requiring standardized inoculum preparation, including antimicrobial susceptibility testing, microorganism identification, fermentation monitoring, and other laboratory procedures involving bacterial or yeast cell density measurement.
The Den-1B measures optical density and displays results digitally in McFarland units. It is factory calibrated for use with 16 mm diameter glass tubes and retains calibration settings even without power supply. The instrument can also be calibrated using 2 to 6 points within the 0.0–6.0 McFarland range, with the option to restore factory calibration settings when required.
Key Features
| Feature | Details |
|---|---|
| McFarland Turbidity Measurement | Measures microbial suspension turbidity in McFarland units |
| Wide Measurement Range | 0.00–15.00 McF measurement range |
| Recommended Accurate Range | 0.0–6.0 McF with ±3% accuracy |
| Fast Measurement | Provides results in approximately 1 second |
| Digital Readout | LCD display with 0.01 McF resolution |
| LED Light Source | Stable LED-based optical measurement |
| 565 nm Wavelength | Measures at 565 ±15 nm |
| Flexible Tube Compatibility | Supports 12 mm, 16 mm, and 18 mm tube diameters with appropriate adapters |
| Calibration Flexibility | Supports 2–6 point calibration in the 0.0–6.0 McF range |
| Factory Calibration Restore | Allows restoration of factory calibration settings |
| Compact Design | Small footprint for routine laboratory bench use |
Applications
Liofilchem™ McFarland Densitometer, Den-1B is suitable for:
- Standardization of microbial inoculum density
- Antimicrobial susceptibility testing workflows
- Microorganism identification test systems
- Measurement of bacterial and yeast cell suspensions
- Fermentation process monitoring
- Quantitative estimation of colored solutions absorbing green light
- Absorbance-based measurement at a defined wavelength
- Routine clinical, research, pharmaceutical, food, and industrial microbiology laboratories
Product Specifications
| Specification | Details |
|---|---|
| Product Name | Liofilchem™ McFarland Densitometer, Den-1B |
| Measurement Range | 0.00–15.00 McF |
| Standard Working Range | 0.0–6.0 McF |
| Approximate Cell Density Range | 0–180 × 10⁷ cells/mL |
| Display Resolution | 0.01 McF |
| Light Source | LED |
| Measurement Wavelength | 565 ±15 nm |
| Accuracy, 0.0–6.0 McF | ±3% |
| Measurement Time | 1 second |
| Sample Volume | Not less than 2 mL |
| Tube External Diameter | 12 mm, 16 mm, or 18 mm |
| Tube Adapters | A-12 and A-16 adapters for 12 mm and 16 mm tubes; 18 mm tubes used without adapter |
| Calibration | Factory calibrated; user calibration by 2–6 points possible |
| Factory Calibration Restore | Yes |
| Display | LCD |
| Dimensions, W x D x H | 165 x 115 x 75 mm |
| Weight | 0.7 kg |
| Input Current / Power Consumption | 12 V, 7 mA / 0.1 W |
| External Power Supply Input | AC 100–240 V, 50/60 Hz |
| External Power Supply Output | DC 12 V |
Standard Set
| Included Item | Details |
|---|---|
| Den-1B Densitometer | Main instrument |
| External Power Supply | AC 100–240 V input, DC 12 V output |
| A-16 Adapter | Adapter for 16 mm diameter tubes |
Calibration Note
The unit is factory calibrated for operation with 16 mm diameter glass tubes and retains calibration without power supply. For maximum reliability, Liofilchem standards are recommended for calibration, although other commercial or self-prepared standards, such as BaSO₄ standards, may also be used.
Storage & Handling
Place the densitometer on a stable laboratory bench in a clean, dry environment. Use clean tubes with sufficient sample volume of at least 2 mL. Ensure that tubes are compatible with the correct adapter and that the outside of each tube is clean before measurement to support accurate turbidity readings.
The Liofilchem™ McFarland Densitometer, Den-1B provides fast, compact, and reliable turbidity measurement for microbial suspensions. With a wide measurement range, 0.01 McF resolution, rapid 1-second measurement time, calibration flexibility, and compatibility with multiple tube sizes, it is a practical tool for microbiology laboratories requiring accurate McFarland standardization.