Review on Saltwater Aquarium Seawater | Salinity 0.95-1.08 by Victor Garro

I cannot check if the product works. Reading water with my refractometer shows my specific gravity is 1.025, the calibration of this device was completed before my measurement. This instrument reads 1.021, which is a big difference for a saltwater aquarium. The seller wants me to replace the batteries with new ones and try again. Your instructions are difficult to understand and calibration is confusing. Presumably you are using a sizing solution, but there is no solution and I can't even buy one that you can buy from Revain. Not quite sure if this device is working properly.