The Bettersizer ST Laser Particle Size Analyzer

The Bettersizer ST designed by Bettersize Instruments is a laser diffraction particle size analyzer with Dual Lens Optical System (DLOS) which provides a compact design without resorting to folding optics that are sensitive to misalignment induced by vibrations often found in a majority of industrial laboratories.

Bettersizer ST Overview | Laser Particle Size Analyzer for QC

Video credit: Bettersize Instruments Ltd.

The ST Laser Granulometry incorporates 86 high-speed detectors, which produces the high-resolution data from 0.1 to 1000 microns. This high-speed detector system delivers fast and reliable particle size distribution results, often in as little as 15 seconds.

Image Credit: Bettersize Instruments Ltd.

Features and Benefits

Dual Lens Optical System (DLOS)

The Bettersizer ST features the patented Dual Lens Optical System (DLOS) that enables it to quantify a broad range of continuous particle sizes without any compromise.

The forward, lateral, and backscatter laser diffraction pattern is detected by the DLOS. The DLOS is an innovative technology that leads to an increased particle size measurement range without the additional cost of a second light source. This single laser design provides for higher accuracy due to a consistent wavelength throughout the full measurement range.

Image Credit: Bettersize Instruments Ltd.

Automatic Test

The SOP of Bettersizer ST offers an intuitive solution for automatic and standardized testing. With just a single mouse click, 'Auto Test' starts auto-alignment, quantifies the background, alerts the operator to add the sample and subsequently quantifies and prints out the result without any more intervention.

Image Credit: Bettersize Instruments Ltd.

Efficient Wet Dispersion System

The Bettersizer ST has a centrifugal pump that serves as the main element in an extremely efficient dispersion system. This system ensures quick and reproducible dispersion of samples. Before performing a test, the pump starts an automated sequence that prevents bubbles which otherwise can adversely affect results.

Rugged and Compact Design

The Bettersizer ST incorporates a solid-state laser diode that offers long life while preventing laborious instrument warm-ups. The compact footprint of the ST frees up precious workspace.

High-Resolution Data

  • Accurate measurement ranging from 0.1 to 1000 µm by the patented Dual Lens Optical System (DLOS)
  • Optical bench includes 86 optimally spaced detectors to span the entire size range
  • Single diode laser boosts the reliability and precision of the system at a reduced cost

Fast Results

  • Highly efficient dispersion system provides a statistically representative specimen to the measurement cell, thus ensuring quick and reproducible sample outcomes
  • Provides precise and repeatable results in just 10 seconds
  • The 'Auto Test' feature completely automates the whole test sequence by reducing operator errors

Designed for Quality Control

  • Compact and robust design
  • Easy-to-use software
  • Low cost of ownership
  • Standard Operation Procedures (SOP) to further reduce operator errors


The instrument finds applications in the following fields:

  • Pharmaceuticals
  • Building materials
  • Soils and sediments
  • Polymers and metals
  • Ceramics
  • Agrochemical analysis


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