V·RESOURCING Seawater Salinity Refractometer, Automatic Temperature Compensation Sea Water Salinity Measurer for Aquarium,Hydrometer,0-100ppt & 1.000-1.070 Salinity Specific Gravity

Pretty good device for measuring the salinity of sea water. Comes in a plastic box with pipette, microfibre cloth and small screw driver for adjusting the calibration. It works well but it helps if you have a bright light source to illuminate the display. The eye piece can be focused to assist with making the reading but I found it quite sloppy. All in all though a great little device which works brilliantly.

Having calibrated with a known sg 1.024 It has worked great for monitoring the salinity of many marine tanks, great value for money highly recommend!

Not sure how accurate this is so cannot comment as everytime it's checked one after the other it was a different reading

Excellent product, arrived quickly and has shown a low salt content in my marine fish tank, which is why my corals were suffering. Great quality and easy to set up and use.

I have been using it for a few months and it has been working well. I recommend to all the beginners as me.

It's very good a hundred times better than the Red Sea, and once set it holds the parameters.I highly recommend.

Mine is consistently off by about 0.002, so my water from the store is 1.024, but this is reading as 1.026, even after calibrating several times. Now I know it's off by 0.002, it's okay, but I don't 100% trust it. In the end, I bought the Hanna salinity pen and use this as a backup.

It is very accurate