AUTOUTLET Salinity Refractometer, Automatic Temperature Compensation Salt Water Tester Hydrometer 0-100 ppt & 1.000-1.070 Specific Gravity ATC Refractometer for Sea Water Aquarium Tank Marine Industry

I have to use refractometers at work on a daily basis. We have the red sea and the d&d versions. This one does the same job for way less cost. I do find i need to recalibrate it a bit more often, but that honestly is not a big deal, takes like 2 seconds.

When i first received this i thought it was faulty, the enclosed instructions state to calibrate screw the knob until its zeros. I tried turning knurled nob which didn’t move, so i went back to the product page and saw that it was inside this knob that needed adjusting with a screwdriver (supplied with kit, under the three pipettes) now its zeros perfectly. I feel that the 7% one star reviews are maybe due to people trying to adjust the knurled knob. Device works great if set up correctly and I’m 100% pleased with it

Just setting up 1st marine tank. So this is all new to me. The refractometer comes with a plastic case and 3 pipettes and simple instructions. I first focused it for my eyes and then checked the calibration and it was spot on. Then tested the salt level in my tank and added some more salt to bring up to the correct level. The refractometer is simple to use. Just add a drop or 2 of liquid an stand under a bright light when you take the reading. Wipe of the liquid before putting back in the case. I have no way to check the accuracy , but I feel confident it is ok.

First you need liquid to clean then set it at 0 then do reading and it works well

Really good piece of kit, wondered wether it was worth taking a chance on a “cheap” one, but it does exactly what it says on the tin. Really simple calibration. Recommended

I bought one of these to keep on top of my salinity. I check it every fortnight and it does the job, the instructions are clear I recalibrate every month with RO water to ensure I get the correct level. Easy to use treat yourself happy fish keeping.

Great price. Great product! Worked perfectly

Had this tested with other marine shop to verify and was even close. Yes it was calibrated to zero . Return was made. Be careful with your reef equipment Quality it was very light . Not much more . Obviously was good enough