Bettersizer ST


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Bettersizer ST – Particle size measurement 0.1 – 1,000 µm

The Bettersizer ST is a compact, highly integrated instrument for the analysis of particle size distributions. It analyzes particle size distributions according to the principle of static light scattering (laser diffraction). Short wavelength laser light (635 nm) hits the particles to be characterized and is elastically scattered depending on the particle size. The stationary detectors determine the angular dependence of the scattering intensity in forward, lateral and reverse direction. Data preparation according to either Fraunhofer or Mie theory provides the volume-based particle size distribution of the sample.

In addition to the optimal price-performance ratio, the Bettersizer ST has the following essential advantages:

  • Dual Lenses optical system (DLOS)
    is a patented technology of the Bettersize instruments and integrates forward, sideways and backward scattering to double the scattered light. Compared to simple lens systems, DLOS improves resolution and measurement accuracy, compared to multi-laser systems, DLOS enables more consistent results through laser technology.
Design of Bettersizer ST

Aufbau des Bettersizer ST.

  • Standard Operating Procedures (SOPs)
    allow a simple and standardized measuring procedure for highest reproducibility
  • Auto centering function
    guarantees an optimal adjustment of the optical measuring system for highest reproducibility
  • Accuracy calibration
  • Auto circulation & dispersion system


  • Particle size measuring range for: 0,1 – 1.000 µm* (wet dispersion)
  • Innovative optical system: Dual Lenses optical system (DLOS)
  • Duration of a measurement < 1 min
  • Easy operation and data management for quality control
  • Ideal price-performance-ratio
  • Simple and intuitive software handling with clearly structured software interface
  • Working with Standard Operation Procedures (SOP)
  • 21 CFR Part 11, ISO 13320, CE
  • Data export to Excel, PDF, Word, JPG, and more

* The measuring range depends on the sample.

Literature and Norms

/1/ ISO 13320 Particle size analysis – Laser diffraction methods

Other instruments

Bettersizer S3 seriesStatic light scattering 0.01 – 3500 µm
Bettersizer 2600Static light scattering 0.02 – 2600 µm
BeNano seriesDynamic Light Scattering 0.3 nm – 15 µm
BeVision D2Dynamic image analysis 2 µm – 10000 µm
DT-100Acoustic attenuation spectroscopy 5 nm – 1000 µm
DT-1202Acoustic attenuation spectroscopy 5 nm – 1000 µm

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