refractometer

[asteris_veria]

http://www.aliexpress.com/item/Retail-Free-shipping-Salinity-Refractometer-0-10-salinity/465985425.html



http://www.aliexpress.com/item/Salinity-refractometer-P-RHS-10ATC-For-Marine-Keeping-Salinity-testing-black-rubber-Marine-fishery-and-the/32214438561.html



ποιο απο τα 2 λετε να παρω?