Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution (color may vary)

Great for my reef tank. Very accurate.

We have a small educational aquarium with around 25 tanks and our staff uses this daily. It is very easy to use and holds up pretty well with all the use. It is easy to store based off size. Water stays on reader and is easily cleaned off. This is a good value for all the benefits it provides. The dark color helps hide any blemishes from wear and tear.

I don't get excited over new gadgets very often, but this tool is awesome. I am new to salt water aquariums and needed help with maintaining the correct specific gravity for my sea anemones. This meter has been accurate every time I have used it.

i got this at someone's recommendation. i must say i was pleasantly surprised. I'm 6 months in, and its still going strong. i highly recommend though for anyone with any refractometers, to buy here on amazon a refractometer calibration liquid set at 1.026 just so you can always know with certainty. i mean its nice to know your refractometer is still accurate.

First unit tested the calibration solution that came with it (1.025 SG) at 1.023SGI have a bottle of a different calibration solution, the most popular one on here, (1.026 SG) and it tested 1.028 on the Milwaukee. I calibrated several times using the distilled water, making sure the lens was clean each time, also waited 1 minute before testing and got the above results every single time. My reef tank tested at 1.028 SG as well. On my $20 lens refractomter, the calibration solutions all tested accurately and my tank tested at 1.026. Those of you who have reef tanks can probably understand I almost had a heart attack when it tested 1.028 SGI opted to have a replacement sent and this one also did not test properly.The 1.025 Calibration solution did test at 1.025 SG but my 1.026 SG calibration tested at 1.028 SG along with my tank. The $20 refractometer tested properly again with all three tests.Forgot to mention that I also used a hydrometer just to triple check everything and the tank tested at 1.026 SGSending back the replacement for a refund.Reefers beware, this is not an accurate tester.

This one is hard to do a good review . first of all for the price the ma800 case should of come with it .Now it get tricky . the celebration is simple and easy . I had no problems zeroing it out . The problem is the verification . I see so may reviews in utub saying the same thing . The verification solution is marked 1.025every reading I take I get 1.027 one out 10 1.026. Now if I take that same solution 1.025 and us it with my refractometer . I get a 1.025 reading . if I use my refractometer verification solution at 1.025 with the Milwaukee ma887 I get 1.025 . so to me Milwaukee is using a 3rd party verification solution that is not correct . I have yet to write to Milwaukee to see what they say . It Does state plus or minus .2 . It is very precise get the same number over and over . So the way my unit reads I always mines .01 if it reads 1.026 I will record the reading at 1.025 . then I will verify that reading in the next day using my refractometer. Also the MA877 doesn't read in halves if the reading is 1.025.6 it will read 1.026

I struggled with small cheap plastic hydrometers for many years and I've always doubted their accuracy, mainly because of air bubbles and degradation of the plastic as it ages. I've seen people use the optical ones but they are always pointing them at the room light to try to get a reading. It's nice to have something really accurate for a change that you can read in any light, I especially like that it takes into account the temperature! I'm amazed at the low price, this could easliy sell for $300 or more. It's really fast and easy to use. If there was one thing I could change it would be that I wish it had one more decimal place so you can tell if it's between for instance 1.023 and 1.024. If it read 1.0235 that would be awesome, but realistically the small changes in salinity between numbers won't have an effect on your aquarium.For those new at changing water I can share my method. I have a 14 gallon nano cube and I change 2 gallons twice a week. I measure out my water in gallon water jugs, similar to milk jugs only they had distilled water in them. I fill them with RODI water for my salt mix. Then I weight out 293 grams of Kent Marine Reef Salt Mix using a gram scale. That brings the salinity to 1.024 (263 grams will bring it to 1.021). Then I pour one gallon of water in a five gallon plastic jug, pour in the salt, cap and invert to mix several times. Then I pour in the last gallon rinsing out my salt container in the process, cap and invert to mix again. This initial mixing puts most of the salt into solution. Then I add a small powerhead and aquarium heater for a few hours and everything goes into solution without any further mixing. Then using two other gallon jugs I empty out exactly two gallons and pour in the fresh saltwater. Works like a charm!

Accurate, easy to use, easy to calibrate. It has made the testing process for my salt water reef tank so easy! Look no further!