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 secondPrecision: 3%Readings, conveniently shown in McFarland units, are clearly visible on the bright LED displayFactory calibrated - retains calibration without power supplyCan be user calibrated with commercial standards or cell suspensions prepared in the laboratoryDesigned for tubes with an outer diameter of 18mm. 16 mm tubes can also be accommodated by using the optional tube adaptor D-16Extremely compact design with small footprint and low profile - fits easily into the smallest workspaceDEN-1b - either battery powered by 3 x AAA or via external power supply