An OPTi Digital Handheld Refractometer that has 3 preset scales for the production of beer.

The primary scale in this OPTi digital refractometer is for brewers looking to measure Wort prior to fermentation. The scale of Wort Specific Gravity (SG) offers brewers a far better way to measure when compared to the conventional method of purely using a hydrometer.
Not only will you need far less sample with an OPTi refractometer (no waste of that precious brew) but in wet brew-house conditions this pocket sized refractometer is far easier to handle.

Dropped glass hydrometer jars are a thing of the past.

The Brix scale is now often used by brewers with the aid of common online calculators. The Zeiss scale is used in conjunction with a hydrometer to calculate the alcohol content of finished beers to an accuracy of 0.5 %ABV and is commonly used to assess the progress of in-bottle fermentation.

Scale A is set to Wort SG (Sucrose Equivalent)

Scale B is set to °Brix (ATC)

Scale C is set to °Zeiss (ABV) 

The OPTi Digital Handheld Refractometer – Wine ABV (Zeiss/Brix) scales are preselected at despatch, but may be reassigned using the scale selection.

PORTABLE, POWERFUL, AND READY TO GO

The OPTi® Digital Handheld Refractometer puts a powerful, fully portable instrument in the palm of your hand. Powered by just 2xAAA batteries, the OPTi refractometer can take 10,000 readings in 50 common refractometer scales.

OPTi refractometers are made in the UK and feature a durable IP65 rated housing, a stainless steel prism dish which rapidly stabilises sample temperature, and a clear LCD display. All tri-scale OPTi refractometers have the ability to measure across the full 0-95 °Brix range.