What Determines Accuracy in Handheld NIR Testing
Handheld NIR analysers use near-infrared light to measure molecular information from a sample. They are commonly used for rapid screening, identification, and quantitative analysis where suitable reference data and calibration models are available.
The accuracy of a handheld NIR device is strongly linked to the calibration behind the result. A model built from representative samples, reliable reference laboratory data, and a relevant concentration range will generally perform better than a model used outside its intended scope.
Sample condition also matters. Particle size, moisture, temperature, surface texture, mixing, container type, and optical contact can all affect the spectrum collected by the instrument. For this reason, handheld NIR is most reliable when the sample is presented consistently, and the method has been validated for the application.
Handheld NIR should not be treated as a universal replacement for laboratory analysis. It is often most useful for fast, non-destructive field or process decisions, with laboratory testing used to build, verify, or periodically check the calibration model.
Reviewing Handheld NIR for Your Application
For more detail on the measurement principle, review PAS’s overview of Near Infrared Spectroscopy technology. To compare suitable instruments, explore PAS’s NIR analysers through Portable Analytical Solutions, or contact our team to discuss your material, calibration needs, and accuracy requirements.