Comments: quick and easy what more can i say.

Comments: I have used cheap hydrometers in the past but this is by far the WORST I have come across. I just purchased a Refractometer.

Comments: I bought this hydrometer because I have used other Coralife products, and have been very happy. This product, however, is not living up to its claim. If you hold the unit by the little tab at the top, it floats and only collects water skimmed from the surface (it claims to collect from 6 in below surface).I have to tap on it to get a reading. In fact, I find myself checking and rechecking. I'm going back to my old hydrometer. I don't trust this product.

Comments: The deep six hydrometer works great. Just make sure you know how to use it properly. Tap all of the bubbles out and fill it clear to the top.
<br /> A difference in salinity of .010 isn't going to kill even the most finicky of marine life. Not even close. Give your animals more credit.

Comments: This product is very easy to use, but it gives incorrect readings. Do not trust it.I always rinsed it in freshwater after use. I usually had to take several readings and tap to release air bubbles in order to get a consistent reading. But ultimately I was having to add too much salt mix to my replacement water so I figured the hydrometer might be wrong. I bought the refractometer, calibrated it, and found that my tank was actually running at 1.030. It wasn't a total disaster, but it is definitely not what I wanted. Skip the cheap hydrometers and get something you can trust.

Comments: Dont waste your money on this product. Spend an extra 30 dollors and buy the marine depopt refractometer. They are like 40-50 bucks. These are really never calibrted to begin with, and are almost always extemely wrong with there readings. Dont waste your time or money.

Comments: They "may" be good for you at first... IF they are. Othewise over time they will 100% for sure fail you. Salinity in a reef tank has to be controlled pretty tight. My swimgarm told me I had 1.025.. it was 1.029 via Refractometer. I HIGHLY suggest a refractometer... they are cheap... just a tiny bit more than a swingarm.

Comments: Purchased this hydrometer in hopes of keeping my hands dry and replacing my Instant Ocean hydrometer. While it does keep your hands dry it was completely uncalibrated. My Deep Six measured the SG at 1.024 when a calibrated refractometer at the LFS read the SG at 1.031! Completely inaccurate, would never purchase again.

Comments: I had a similar experience as others, in that the reading was off by 0.004! (yes, enough to do damage). I took it to the pet store and when using a sample of water which was confirmed at 1.022 with a fancy refractometer, the reading was 1.018 on the deep six! So the salesperson agreed to ship it back to Coralife and opened a new one for me. Guess what that one read 1.019! Don't waste your money. The Instant Ocean (Marine Depot Item # AS2141) is much better once you learn how to get the water in it without bubbles (which admittedly is tricky with that model).

Comments: i just set up my first saltwater aquarium. since i am not an expert by any means i have a lot of questions and need detailed instructions, even for the simplest of things. i used my hydrometer last night and it really easy to use after i went to my local pet store and asked them how to use it. i am only giving this product 4 gold stars because of the lack of clear directions.

Comments: This hydrometer recently caused me some serious grief. It was reading my new 24 gallon aquapod's salinity at 1.024. My local aquarium store also measured the salinity with their own Deep Six hydrometer, recieving the same reading...perfect right? No. I soon discovered that every fish i bought would die after about a week even though my water chemistry was perfect. On a whim, I purchased a good quality refractometer and tested the salinity. This more precise device measured the salinity at a wopping 1.0295! No wonder fish were dying. So... one faulty hydrometer right? No. After bringing my refractometer to my aquarium store the salseperson was shocked to find that all three of his deep six meters were also in error, as his systems were running at a much higher salinity than he expected. In conclusion, if you are truly serious about fishkeeping, invest in a refractometer. Hydrometers like the Deep Six are simply to unreliable to entrust with the lives of expensive livestock.

Comments: Ok, here is the trick to using this baby... don't forget to sink it rightside up into the water... I have watched people dip it top-first into the water- which is cool too, but not as accurate a reading and not the point of it. First if you do it top first, you get a bunch of bubbles on the pointer... BAD NEWS. Either way you do it, make sure you tap, tap, tap, the hydrometer on a table or your head or something else hard to displace the micro-bubbles on the pointer. You may think they don't matter, but they really, really can change the reading.

Comments: Keeping my hands out of the water gave me a greater peace of mind. Very good product to have on hand.