O Oasis4-String Ukulele, Original Version (OH-18)

Its dry in Colorado and this product works great. However, the instruction are meant for a more humid climate, so it requires H2O refills more frequently that is reported in the packaging if you live in a dry climate. Colorado never reaches 40% humidity. But still works great

I've used Oasis humidifiers with my acoustic guitar for several winters now, so I went to them again to humidify my ukulele. The OH-18 (ukulele) is very similar to the OH-1 (guitar) in that it is a capped water vapor-permeable tube filled with absorbent crystals and comes with a hangar to place the humidifier in the instrument's sound hole. You periodically refill the tube with distilled water which is absorbed by the crystals to form a gel (prevents leaks) and the permeable fabric sides allow water vapor to escape and humidify the instrument. The fabric tube will begin to shrivel when it needs more water. How long that takes will depend on the relative humidity where you store your instrument and whether you have it in a hard or soft case. I average around 27% RH in the winter, both instruments are in soft cases and I end up adding water every 3-4 days.Overall, I'm happy with the OH-18 but there are a few drawbacks that I didn't experience with the OH-1.-The hangar did not fit the tube. The opening was too small. I had to carefully enlarge the opening with a razor blade.-I use this with a concert ukulele and find it difficult to place the humidifier in the sound hole. The tube is the same size as the one for guitars, but you place it parallel to the top of the uke instead of perpendicular to it. I manage to get hung up in the top bracing almost every time I replace it. I can't even imagine getting it inside a soprano without a hassle.I have not had leaks with any Oasis Humidifier I've used. A few tips:-Be very careful when you first open it so that you do not spill any crystals. If you do, then order replacement crystals. The crystals prevent leaks by turning the water into a gel, so you need the full amount.-Only use distilled water. Impurities in tap water can block the pores in the fabric.-Don't touch the fabric if you can avoid it. Hold the humidifier by the lid or the rubber top and bottom.-Be careful when refilling not to get the outside of the humidifier wet. Use the included syringe and go slowly-the gel will expand as it absorbs water. Do not overfill. If you overfill, you will weaken or burst the seam on the tube and may get leaks. I also leave my humidifier out on the counter for about 10 minutes after I've refilled it to be sure that all the water has turned to gel before placing it in the sound hole.-I think it's better to refill before the humidifier has started to significantly shrivel. There's less stress on the seam that way. When it's reduced in volume about 25-30%, I refill it rather than waiting for it to start to really crumple.

My husband likes these for his ukuleles!

Husband loves it.

I really like this humidifier for my ukuleles. It’s easy to fill and creates more humidity so the wood of your ukulele does not dry out. It cost more to buy and you need to replace the crystals every Spring but if the wood on your uke dries out it cost more money to have it conditioned by a luthier. Your ukulele also sounds better if you don’t let the wood dry out.

We have 4 types of guitar and ukulele humidifiers. These are the best. They last a week or more. Get a couple humistats, stick em' around the house and especially near the ukes and instruments if they are left out hanging or on rests. If you are reading 25% humidity or more, get this one for each sound hole. If you read below 25%, get the tan version of this, the "+." This will release much needed extra humidity to protect your babies. For my situation, I need tans all around.Don't think you can avoid humidification if you hold instruments in cases. You still need one in the sound-hole. If your room where you store the instruments dips (ever) below 35%, (this tends to coincide with drops in temperature outside) you need to humidify the room consistently (get a whole house one, trust me, its cheaper and so much easier in the long run.) or you risk permenantly damaging your precious instruments. Electric instruments also need humidification, as the glues and parts will separate. Unfortunately, it only takes ONE drop or major rise sometimes to crack or warp a good quality uke. Trust me, I own 3, 2 are made in Hawaii- a Kaniliea' and a Kamake- the best. The Kanilea' tenor is a spalted koa and ran me $900. It cracked immediately along the back, humidity related. The frets that were like butter became sharp. The fretboard warped as well as the top- nit enough to see; but enough to create issues when playing certain chords. It was an expensive lesson. The kamake concert lives in its hard case with its oasis himidifier and is perfect. If you can't consistantly control your humidity to be 35-55%, (much harder than it sounds) you need these. My humidity issue is so all over the board and my instruments valuable enough that I will eventually buy a glass disay case specifically for my uke collection. They don't tell you this stuff when you buy the instruments, but you gotta take care of them, its more cost and work. Don't buy any instrument of significant value if you don't have a controlled humidity environment. The easiest way are these oasis humidifiers (much better than thr crappy inserts that you need to fill constantly and drip.) and leaving the instruments in their hard cases when not in use.

Leak proof, keeps the water in the humidifier.The diameter of the hard plastic top makes insertion in my 8-string difficult.

Super cool gadget I got to baby my new baby (ukulele). I ordered this after researching proper care for the lovely ukulele I bought... after all if I'm spending money on a higher quality uke, I might as well take care if it, right? I live in a very dry climate (high desert) and this will come in handy for keeping the wood of my uke in shape for years to come! The design of my uke doesn't allow me to put the humidifier into the sound hole (I have a Luna Peace uke with a cool peace symbol design over the soundhole)... however this shouldn't be a problem with regular designs. I am planning on using it in the bag instead.Easy to fill, nice size. A great.way to keep your instrument in good shape. You will value this purchase!

Really had to squeeze on the string holder which is an important part of the humidifier. Also syringing is blind - it takes several syringes of distilled water (get at a pharmacy - one gallon judge is about $1-2 - should last a few years) and can easily overfill if not careful. It fits differently from the other type, perhaps its best aspect - supported by the strings without distorting them and sits inside the body of the ukulele. Not expensive, so no harm.

During dry winter months, I refill every week at least. After several years of seasonal use black spots (mold?) appeared - it's time to throw it out and buy a new one.

I own four of these humidifiers. 3 for guitar and this one for my Ukulele. They really work well and don’t leak into my instruments!

I have one in all my Uke's. This is a good price...I've seen them sell for more. I would use one in any wooden instrument. It's nice that they hang inside the uke, so it can get the moisture it needs. I also like that you can actually see when they need to be refilled.

The piece that is supposed to allow you to put the humidifier tube into the body of the ukulele will not go into the tube. I would stick with the case mounted humidifier marketed for guitars.