This optional Reference Block and 2ml Dioptric Oil is used for New Design Handy Portable 58-90% Brix Honey Refractometer (RHBN-90ATC) and Tri-scale Measurement Portable Honey Refractometer (RHB-90ATC) .
This optional Reference Block and 2ml Dioptric Oil is used for New Design Handy Portable 58-90% Brix Honey Refractometer (RHBN-90ATC) and Tri-scale Measurement Portable Honey Refractometer (RHB-90ATC) .