Hanna Portable Digital Refractometer - HI96822 Digital

The Digital Refractometer Tester by Hanna gives easy, accurate and fast results for measuring specific gravity in your aquarium

Digital Refractometer for Seawater Analysis - HI96822

The HI96822 is a rugged, portable digital refractometer designed for the measurement of salinity of natural or artificial seawater.

The HI96822 displays results in three popular measurement units: Practical Salinity Units (PSU), salinity in parts per thousands (ppt) and specific gravity (S.G. (20/20)).

The instrument’s high accuracy and simple operation gives reliable results each and every time. All readings are automatically compensated for temperature variations and displayed within a 1.5 second response time.

The sealed flint glass prism and stainless steel well are easy to clean. Just wipe with a soft cloth in preparation for the next sample.

The HI96822 Digital Refractometer eliminates the uncertainty associated with mechanical refractometers by measuring the refractive index to determine the salinity of natural and artificial seawater including brackish, ocean water or saltwater aquarium.

The instrument converts the refractive index of a sample to PSU, ppt and specific gravity.

These conversions are based on respected scientific publications using the physical properties of seawater (not sodium chloride).

The HI96822 is an easy to use tool for measuring salinity in natural and artificial seawater whether in the field, lab or at home.

Refractive index is a measurement of how light behaves as it passes through the sample. Depending on the sample’s composition, light will refract and reflect differently.

By measuring this activity with a linear image sensor, the sample’s refractive index can be assessed and used to determine its physical properties such as concentration and density.

In addition to the linear image sensor, the HI96822 uses an LED light, prism and lens to make measurement possible.

Variations in temperature will affect the accuracy of refractometry readings, so the use of temperature compensation is highly recommended for reliable results.

The HI96822 contains a built-in temperature sensor and is programmed specialised algorithms then apply temperature compensation to the measurement and convert the refractive index to: PSU (Practical Salinity Units), ppt (part per thousand) or S.G. (Specific Gravity) (20/20).

PSU is defined as the conductivity ratio of seawater to a standard KCl solution.

It is based upon the work of the UNESCO, ICES, SCOR, and IAPSO.

This information is published in The Joint Panel of Oceanographic Tables and Standards.

An older salinity scale is ppt (10-3), where salinity is defined by “the salt content is the weight of the inorganic salts contained in 1 kg of seawater if all bromide and iodide are replaced by an equivalent amount of oxides” (Knudsen, 1901).

Specific Gravity (20/20) is based upon the published relationship between density at 20 °C and the mass of dissolved salts in the seawater sample (CRC Handbook of Chemistry and Physics, 87th Edition).

Calibrate with distilled or deionized water

Sample size can be as small as 2 metric drops (100 μl)

Samples automatically compensated for temperature variations

Readings are displayed in approximately 1.5 seconds

The dual-level LCD displays measurement and temperature readings simultaneously

Easy to clean and corrosion-resistant

Battery percent level remaining at startup and low battery indicator

To conserve battery life the meter shuts off automatically after three minutes of non-use

Water resistant ABS plastic casing designed to perform under laboratory and field conditions.