|Search By Accuracy|
Most operate on the same general critical angle principle as a traditional handheld refractometer. The difference is that light from an LED light source is focused on the underside or a prism element.
When a liquid sample is applied to the measuring surface of the some of the light is transmitted through the solution and lost; while the remaining light is reflected onto a linear array of photodiodes creating a shadow line. The refractive index is directly related to the position of the shadow line on the photodiodes. Once the position of the shadow line has been automatically determined by the instrument, the internal software will correlate the position to refractive index, or to another unit of measure related to refractive index, and display a digital readout.
Our digital refractometers are warranted for two years against defects in workmanship and materials when used for its intended purpose and maintained according to the instructions.
"We use HANNA's Digital Refractometer for Measurement of Sugar in Wine at our vineyards and find it very accurate"
- Wes, CA
"For salmon farmers, salinity levels need to mirror conditions in the wild at each life stage. The Hanna HI-96822 Seawater Refractometer now makes it quicker and easier for fish farmers to test and maintain these vital levels."
- Nick, ME
"In the printing industries, percentage of Isopropyl Alcohol (IPA) in fountain solution is measured. We use the HI 96801 digital refractometer for testing."
- Joan, NY