RHS-10ATCc Black Salinity Refractometer Dual Scale PPT & SG + 35ppt Standard RHS-10ATC Just place a drop or

Just place a drop or two of glycerin (glycerol) or propylene glycol in the stainless-steel sample well and press a button

and the MASTER-3PM is plastic

They lost out on fees

Item Description: Misco Palm Abbe PA202 Dual Scale Portable Digital 0

RHS-10ATCc Black Salinity Refractometer Dual Scale PPT & SG + 35ppt Standard RHS-10ATC Just place a drop orItem Description: RHS 10ATCc Economy Portable Salinity Refractometer WITH 35ppt SALINITY STANDARD (3. 6ml Vial) Comes in a Clear Resealable Pouch Product Specs * Ranges: 0 100 ppt of Salinity and 1. 000 to 1. 070 Specific Gravity * Accuracy: + 1 ppt 0. 001 Specific Gravity * Divisions: 1 ppt 0. 001 Specific Gravity * Automatic Temperature Compensation (ATC) * Durable lightweight corrosion resistant construction in a Clear Resealable Pouch, 2 Year