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The Grant bio DEN-1 and DEN-1B are a compact benchtop densitometers (suspension turbidity meter) for measuring turbidity of cell suspensions in a variety of life science applications.

The densitometers are designed and factory calibrated to measure turbidity in the range of 0.5 to 4.0 McFarland units (DEN-1) 0.0 to >7.5 McFarland units (DEN-1B) with a small standard deviation. If required, it can deliver a wider measurement range (up to 15.00 McFarland units), but with a greater standard deviation.

  • Measurement range: 0.5 to 4.0 McFarland units (DEN-1), 0.0 to >7.5 McFarland units (DEN-1B)
  • Measurement time : 1 second
  • Precision: ±3%
  • Readings, conveniently shown in McFarland units, are clearly visible on the bright LED display
  • Factory calibrated - retains calibration without power supply
  • Can be user calibrated with commercial standards or cell suspensions prepared in the laboratory
  • Designed for tubes with an outer diameter of 18mm. 16 mm tubes can also be accommodated by using the optional tube adaptor D-16
  • Extremely compact design with small footprint and low profile - fits easily into the smallest workspace
  • DEN-1b - either battery powered by 3 x AAA or via external power supply



Life science - typical applications include determining concentration of cells (bacterial and yeast cells) in the fermentation process, detecting the susceptibility of micro-organisms to antibiotics, identifying micro-organisms with various test systems, and measuring optical density at fixed wavelength.





Dimensions (h x d x w)75 x 115 x 165mm75 x 115 x 165mm
Temperature range+4 to 40ºC+4 to 40ºC
Light sourceLEDLED
Wavelength565 ±15nm565 ±15nm
Range (McFarland units)0.3 to 15.00.00 to 15.00
Measurement time1sec1sec
Tube diameter - external diameter18mm18mm
Tube diameter - with D16 adapter16mm16mm
Sample volume>2ml>2ml
Display/display resolutionLED/0.1 McFLED/0.1 McF
Independent power supply3 x AA batteries
External Power supplyInput AC 120-230V, 50/60Hz Output DC 12VInput AC 120-230V, 50/60Hz Output DC 12V
Power consumption - 230V1W (0.08A)0.1W (0.007A)
Power consumption - 120V  


Densitometer – Optional accessories

Part No


DEN MCF STDSSet of liquid McFarland standards in 16mm ø glass tubes. 0.5/1.0/2.0/3.0/4.0 can be decanted into an alternative tube (shelf-life no longer valid). Requires D16 adaptor, supplies with DEN-1/DEN-1B
D16Spare tube adaptor for tubes with 16mm outer diameter

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