Bellingham + Stanley’s OPTi digital handheld refractometers are versatile and simple to operate and, as one of the smallest instruments of its type on the market, provide for excellent on-the-spot concentration analysis that is automatically corrected for temperature. This produces highly reliable results, particularly when measurements are taken by a number of different operators.
They are ideal for use in many industries like food and beverage, analytical Laboratory and industrial.
https://www.bellinghamandstanley.com/en/refractometers/opti-digital-handheld-refractometer