yieryi Hand Held Salinity 0-4% 20-40ppt (1.000-1.030sg) Refractometer Aquarium Gravity Refractive Index Refractometers

ATC) Temperature Compensation Range:10°C--30°C Refractive Index: 0.001 Salinity: 0.1% Minimum Division:0.1%(1ppt) 0.01sg Specific Gravity Refractive Index: 1.000-1.030sg Salinity: 0-4% (0-40ppt)