Bellingham + Stanley Digital Refractometer RFM300-M SeriesDigital Refractometers for Difficult Samples RFM300 M Series refractometers can measure non homogenous samples such as fruit juice with pulp, opaque chemical compounds and emulsions that are normally difficult to read with optical refractometers or refractometers that do not address the need to measure difficult samples. Created for users looking for a simple yet fully functional instrument, this is a series of digital refractometers with up to 3