Photometers & spectrophotometers

A photometer measures at a few fixed wavelengths, set by filters or LEDs, and is ideal for routine water analysis with ready-made tests. A spectrophotometer lets you select any wavelength within its range, often UV-VIS, and can record full spectra for method development and research. Choose by how flexible your methods need to be. Many labs start with a photometer and add a spectrophotometer later. Instruments for both are in spectroscopy and photometry. Questions about a specific product? Contact sales@luminixhealth.com.

A portable instrument runs on batteries and is made for measurements on site, such as drinking water, swimming pools or environmental sampling. A benchtop instrument offers more parameters, higher accuracy and better options to store and export data, which suits a fixed lab. Some labs use both: portable for screening, benchtop for confirmation. Matching tests are in test kits and water analysis. Unsure which one fits? Ask sales@luminixhealth.com.

For each parameter, such as chlorine, fluoride or calcium, there are reagent kits or cuvette tests for a fixed number of determinations. The method must be programmed in your instrument, so check its method list first. You also need a cuvette in the right shape, round or square, and size. Check the shelf life of the reagents as well. See cuvette tests and cuvettes. Need advice for your set-up? Mail sales@luminixhealth.com.

Measure check standards or a reference solution of known concentration and compare the result with the expected value. Run a blank regularly to zero the instrument. The manual tells you how often to check and what deviation is acceptable. Record the results, so trends become visible before results drift. Fingerprints and scratches on a cuvette also raise the reading. Standards are in spectroscopy and physical property standards. For a quote or a second opinion, write to sales@luminixhealth.com.

A photometer reads absorbance at one or a few wavelengths. A spectrophotometer scans or selects many. Both send light through a cuvette or a well. The wavelength range, UV or visible, and the bandwidth decide what can be measured. A visible-only instrument cannot read a nucleic acid at 260 nm.

A photometer or spectrophotometer sends light through a sample and reads how much was absorbed. In the range where the Beer–Lambert relation holds, absorbance tracks concentration. A refractometer reads how a liquid bends light, which tracks dissolved solids. A polarimeter reads the rotation of polarised light, the classical measurement for sugars. The lamp, the wavelength and the cuvette path length are the three things that have to be right before the number means anything. The optical quantities trace to NIST and the BIPM.

This shelf belongs to Spectroscopy & photometry, inside Lab instruments. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are Refractometers & polarimeters and Lamps, cuvette holders & accessories. The category above this shelf is Spectroscopy & photometry.

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