Comments: Having the scale close to where you need the water to be is very nice and makes it very easy to read.But for setting up water still good to have a Hydrometer to get u in the ballpark because of the closer scale. This is my first saltwater tank, was using a Hydrometer to set up my water and wow it was off.( did not know any better :/)it was at 1.018.I was lucky things where living. Got the water set and wow everything started to grow like crazy! Worth the buy, great little piece, nice case, easy to use. Never go by Hydrometer to set your water, Refractometer is the only way to go!

Comments: Solid, quality instrument and hard plastic case at a fair price. Detailed, easy to follow instructions printed in a typeset that does not require a magnifying glass to decipher.Reading the scale is simple and straightforward. This is the refractometer you have been looking for.

Comments: I have not bought one of these for almost 10 years. This is a nice upgrade. The smaller salinity range alows the scale to be larger and more readable. The optics adjust easily to accomodate old eyes.
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<br />It does what it is supposed to do accurately and reliably.

Comments: This is one of the best items I could have bought for testing my salinity. I highly reccomend it

Comments: I recently purchased a 14 Gallon Nano Cube DX and also bought a hydrometer but just didn't trust it. It was reading the salt kind of high. So I bought the Pro Refractometer and some calibration fluid and my water is perfect at 1.026 where the hydrometer was showing it at 1.028. I feel more confident now that I know exactly what my SG really is in the tank now. Would definitely recommend this product to anyone.

Comments: I am in the process of setting up my first saltwater aquarium. I was using a Coralife Deep Six Hydrometer to measure specific gravity but had reason to doubt the device's accuracy. I figured it was worth $50 to have an accurate salinity reading after investing a few thousand in the tank and various equipment.I recieved the Refactometer from Customer Service in about 3 days and was impressed imediately with the product quality. It is solid, well made and comes with a small screwdriver for calibration and a plastic dropper for drawing water specimens. The instructions were easy to follow and I had the device calibrated and ready to use in about 5 minutes. The refractometer gives you the salinity in parts per million per liter as well as specific gravity which varies with temperature. I found that the Coralife Hydrometer was significantly off.I am pleased with the MarineDepot Refractometer and Customer service. I am very pleased with this purchase. If you can afford to be involved in this hobby which is relatively expensive then you should purchase this product.

Comments: Ordered 5 Aquarium Pro Refractometers for use in a school program. One of the units broke (when teacher was using it, not students)after 1 week of use. Could no longer focus because the plastic collar in the optics broke. Also, the optics require a very bright light source to read the scales clearly. Not the easiest refractometer that I have used.Customer Service is replacing it but I am concerned about the durability of the other units.

Comments: Great Refractometer. I opted to get one of these after getting tired of the micro bubbles in my cheap hydrometer. Come to find out my swing arm was off by .02 go figure. I could of bought a companion for my Clarkii with that money.Get one of these from the beginning so that you can avoid wasting money.

Comments: its a great well made refractometer. easy to use

Comments: The unit I received is of poor build quality. The thing stated falling apart after a few weeks. No matter how focused the unit gets the blue line always stays fuzzy and is skewed by about a degree relative to the scale marks. It constantly needs to be calibrated. After five weeks it is so off that the calibration screw is tighten all the way down and the unit is still not able to read zero when calibrating with distilled or RO/DI water.

Comments: refractometer came calibrated out of the box, I check it every time before I use it and it hasn't had to be re-calibrated yet. So glad I decided to switch to one of these after using a hydrometer, confirmed my suspicions that my hydrometer's readings were way off.

Comments: A must have for any marine aquarium. The scale that SG is displayed on is no larger than other models, it just doesn't display from 1.000 to 1.020 which isn't that useful anyway. I initially thought I should purchase one with a built in light but this refractometer is easily read with only typical room lighting.
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<br />Again, A MUST HAVE!

Comments: This is the same instrument used at our local aquarium shop. It has worked easily and accurately. I would recommend this to any level. I don't think it would be worth the extra money to buy the one with the light built in or the easy hand twist calibration knob. it is easy enough to calibrate the way it is. Good Luck. This has been a great hobby to get into.

Comments: I was pleased to receive my refractometer quickly, and the quality looks to be top notch. It is very easy to use, and to read. The instructions are easy to understand, and it focuses easilly as well. I was using a friends Refr. until I got this one, and this is so much better than the other one. Thank you Marine Depot for having a top quality product to offer to the public.

Comments: I tested this unit against a very expensive Computerized model where I work, and it tested PERFECT. Easy to read, and Love the reef scale.

Comments: IT WORKS!

Comments: Overall this is a good, well constructed product, so you won't be disappointed if you purchase it. The only reason I did not give it a higher mark is their claim that the salinity scale is greatly expanded (by 2.5 times), which is not really the case. While the scale only has gradations between 20-40 ppt, they are not expanded compared to a refractometer that reads from 0 to 100 ppt; they have simply deleted the scale from 0-20 and 40-100. Personally, I would like to see the scale run from 0-40, as I live near an estuary and would like to measure the salinity of brackish water at times, but most reefers won't care about that.

Comments: This is a very easy to use instrument. Only takes 5 seconds to place the drop of tank water on the prism, look through the viewer and read. Comes with lens cleaning cloth, dropper and hard case. The only updgrade that I could see is to include an internal light to view the results. With this device, you have to point it at a fairly bright light source to illuminate the image. Overally an excellent and easy to use refractometer.

Comments: Great refractometer, has quality made look and feel. Tested initial calibration with RO/DI H2O, no need to buy additional calibration fluid. The scale is large enough but bigger still would have been better. The fact that the gradation is targeted for marine aquarium use garners my recommendation for this product over others. A quality integrated light source would also have added bonus point too.

Comments: Very easy to use and calibrate. I would have given it 5 stars but when I received it the eye peice came loose while adjusting the focus. I had to remove rubber sleave and tighten the set screws so it would stay on. Other than that works great!

Comments: I've been using this refractometer for a couple weeks now setting up a new reef tank and am happy with this device so far. It has a nice, solid, well-built feel to it and comes with a good plastic case and accessories. Calibrating it is very easy (you will need RO or distilled water to calibrate, which shouldn't be a problem for anyone looking at this device) and so is using it. I wasn't sure at first what using a refractometer would entail, but this is so nice and accurate to use I wouldn't think of using a hydrometer again.

Comments: very nice scale reading, crisp dispaly and accurate

Comments: Very easy to calibrate and use . I love that it reads both salinity and specific gavity. I tested the accuracy with my old hydrometer and it was spot on salinity 34 specific gravity 1.024 at 78 degrees. Really worth the investment . I gave this equipment 4 stars and not 5 because it didn't have a light for added convience really no big deal but it would be nice !

Comments: I am a beginner but can spot quality. This is a must have tool.