XinJiaYi Water Salt Refractometer, Hydrometer with Two Scales: Specific Gravity 1,000-1.070 and PPT 0-100, Handheld Sea Water Tester for Aquariums, Marine Fish Keeping, Pool Tank
XinJiaYi Water Salinity Refractometer, Dual Scales Hydrometer: Specific Gravity 1.000-1.070 & PPT 0-100 (1‰ = 1ppt = 1000 ppm), Handheld Seawater Tester for Aquarium, Marine Fish-Keeping, Pool Tank
