The Milwaukee Instruments MA887 digital refractometer is easy to calibrate and easy to read and provides highest accuracy possible for the measurement of seawater 3 specific scales. This is the type of accuracy demanded by today's professionals and Milwaukee Instruments delivers.
1. PSU — The newest type scale standard — Letters stand for Practical Salinity Units and is fast become the universal standard for seawater measurement
2. ppt — The old standard of Parts Per Thousand of saturated salt. This is the oldest of the 3 seawater measurements scales
3. S.G. The current standard of Specific Gravity hydrometers and refractometers.