AUTOUTLET Salinity Refractometer Saltwater Aquarium for Seawater, Pool, Tank, Marine, Fishkeeping, 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function Salinity Hydrometer Kit

Accurate salinometer. I do calibrate it each time I use with a home-made calibration fluid. It works a treat, super cheap, and easy to read. Every saltwater keeper should get one as a back-up salinity device.

It's a really good price and works really good so I do recommend it is perfect

This little refractometer works great, it is simple and comes with multiple pipettes, a nice case, a microfiber cloth, and the calibration screwdriver. I would definitely get some distilled water and calibrate it before use, I think mine was off by a little bit when it arrived. Definitely skip the super expensive ones, this will last you for a long time if taken care of. It also can be focused in the handle. The pictures in the listing are accurate.

I needed this for a class study on salinity on various waterways in Florida. It worked beautifully, was easy to use and transported easily. I love the quality of this product.

Nice gadget for the money. But, if you are buying this to monitor your pool, be advised you will be reaching the upper limit for salt concentration at just the fifth bar from the bottom of the scale. That is 1.005 specific gravity or 6.8 parts per thousand which is 6800 parts per million. Around 4500 PPM is the reccommended ceiling for saltwater pools. It works, but all your action will be in the bottom 5% of the scale.Do remove the little rubber cap and calibrate zero using distilled water and a small flat blade screwdriver.I went ahead and bought a digital combo meter that measures salinity, PH, temp, and TDS. That should save some time over this if it works as advertised. It was more than twice the money but hey, it's all in the name of science. I might even come back and let you know how it worked out.

what more can i say

This refractometer works great - it's accurate and extremely easy to use and maintain. The only trick is you need to calibrate it before using it on your fish tank, etc. Calibration is super easy - get a gallon of spring water from the store (mine was a whopping $0.99), and use a few drops of that to ensure that the device is calibrate - it should be reading 0 and 0% on each side, respectively. Once that is done, you can use it to accurately test whatever needs testing. I have compared it with my other salinity gauges for my saltwater aquarium, and this refractometer is consistently accurate while my other gauges are not. I also appreciate that this refractometer comes with a cleaning cloth, three pipettes for water drop collection and application, clear instructions, and a protective case. All in all, this was totally worth the money - I highly recommend this product.

Calibration is said to require a RODI water. I skip that step and use premixed salt water from my LFS and look to match my levels with the premix. If I get what they have I know I’ve got it right. Zero guess work.