At publication time this was the Equal Highest Rated Guitar Humidifier along with the Oasis OH-1.

Simply wet the sponge, squeeze out excess water, replace the sponge into its plastic housing, slide the housing through the strings, and you’re good to go.

However, there is a small quality-of-life feature that helps to increase the product’s ease of use. The top of the MusicNomad MN300 Humitar Acoustic Guitar Humidifier’s plastic casing pops open easily, allowing you to check the condition of the sponge while it’s still resting in the strings of your instrument.

The MN300 also uses sponges with anti-dripping properties, which while not a huge feature, does help to prevent the possibility of water leaking from your humidifier into your guitar.

Specifications:

• Weight: 2.9 oz
• Suspension: Held By Strings
• Longevity: Medium

Pros
Reliability is one of the major reasons why this humidifier is rated highly, it doesn't mess up and works as intended. Being easy to open lid is another plus, allowing for quicker checks, which can save quite a lot of time checking multiple guitars. Those with humidity monitors report that with the MN300, hydration levels are within safe levels.

Cons
There are a few who report mold issues with the sponge, but this maybe due to user neglect than an actual design problem. There are also a few who wish for a thinner version, so that it wouldn't push the strings apart as much.

Overall
The MusicNomad MN300 is ideal for those who want to protect multiple acoustic guitars.

At publication time this was the Equal Highest Rated Guitar Humidifier along with the MusicNomad MN300.

Instead of using a sponge, the Oasis OH-1 uses a special type of gel to humidify without leaking water on your instrument.

It has profile that looks like a syringe, designed to sit on top of your instruments strings with a special cloth that prevents excess water from leaking out while allow evaporated moisture to pass through.

The compact design also makes it viable for acoustic guitars with smaller, or distinctly shaped soundholes, like those from Ovation guitars.

Specifications:

• Weight: 0.8 oz
• Suspension: Held By Strings
• Longevity: Long

Pros
Owners are simply pleased with how the Oasis OH-1 works as intended, and it does so even in places like Colorado with excess heat and humidity fluctuations. Ease of use and compatibility with different acoustic guitars are also much appreciated.

Cons
There are a few who note that this may not fit in tight guitar cases. While others caution that the humidifier gels inside the OH-1 are supposed to be replaced after a period of time.

Overall
With its versatility and ease of use, the Oasis OH-1 will make a great tool for any acoustic guitar owner.

The OH-5 Plus+ is designed for use in area’s with very dry climates, with a fabric that outputs roughly 50% more humidity than the ones used in Oasis’s other models.

Most musicians really aren’t going to need this humidifier, and in areas that are already relatively humid in the winter this humidifier may actually do more harm than good. This is why Oasis only uses this fabric on one model, rather than every model in their line.

Another thing to note about this humidifier is that it will also require more regular refilling than other Oasis humidifiers. This is because the OH-5 Plus+ outputs more humidity than the other humidifiers in their line.

Specifications:

• Weight: 1.6 oz
• Suspension: Held By Strings
• Longevity: Medium

Pros
Reviews of the Oasis OH-5 Plus+ are replete of stories of how it saved many guitars from damage in some extreme weather conditions, be it cold dry winters or hot and dry desert summers. Many users also point to its ease of use to be its strength, making it easy to employ on multiple instruments.

Cons
There are a few who caution to regularly check the humidifier, and to not let it be over damped or dry, as it may cause damage and leak in the future.

Overall
If you live in a desert (this includes high plains deserts, like parts of Wyoming, Colorado, Oregon, and Nevada) this humidifier is definitely worth a look.

At publication time this was the Highest Rated Guitar Case Hygrometer.

The MusicNomad MN305 HumiReader Hygrometer, Humidity, & Temperature Monitor is a great, no frills in-case thermometer and hygrometer.

Its main selling point is that it can actually rest in your guitar strings, giving you an incredibly accurate reading of the humidity your guitar is experiencing. However, while this does help to increase the unit’s accuracy it does mean that you may have to use an incase humidifier as opposed to one that rests on your strings (since that spot will be occupied by the hygrometer).

However, you don’t have to rest the hygrometer on your strings. The unit comes with a clip, allowing it to be stored in the case similar to the Oasis OH-2C above. Likewise, you can also leave it sitting out in your room if you happen to have a room humidifier.

While this isn’t a must-have feature, the MN305 also comes with a reminder of the proper humidity level and temperature for a guitar. It’s a huge help if you’re not used to having to humidify your instruments, because the unit itself will always remind you what the proper temperature and humidity ranges are for your instrument.

Specifications:

• Weight: 0.3 oz
• Features: Humidity Readout, Temperature Readout

Pros
Users are quite satisfied with its fit and practicality, ideal for accurately measuring acoustic guitar humidity at the soundhole. But since it can be attached to a case with the included clip, there are also owners who are pleased with its performance as an in-case hygrometer.

Cons
There are a few who report minor reading inaccuracy, while others note that with a proper humidifier, you won't even need this hygrometer.

Overall
If you're looking for a good humidifier that can rest on the soundhole or in-case, then this one is for you.

At publication time this was the Highest Rated Guitar Humidifier & Hygrometer Bundle.

The MusicNomad MN306 combines their best selling products, the Humitar and Humireader, in an affordable bundle.

Both of them made it to this list as stand alone units, but getting them in a single package allows you to save some more money, and get what you need to protect your guitar from humidity in one go. The Humitar and Humireader sit on the strings on the sound hole, making them ideal for acoustic guitars.

Specifications:

• Weight: 3.2 oz
• Suspension: Sits in Case
• Longevity: Medium

Pros
Since they both sit on the strings on the sound hole area, they both can do their job much more efficiently, getting accurate measurements and hydrating the body. Reliability and ease of use also come up often in reviews.

Cons
Ironically, some users are not comfortable with having 3rd party devices sitting on the strings, which to them causes extra unwanted string tension.

Overall
If you're looking for an affordable way to measure and maintain your acoustic guitar's humidity levels, then check out the MN306 package.

The Oasis HH Combo OH-30 is a digital hygrometer and humidifier packed in a compact profile that hangs in between the strings on the soundhole.

It provides humidity and temperature readings right on its built-in display, so you get immediate visual feedback and removes any guesswork in keeping your guitar within safe humidity levels.

Inside the unit is a polyvinyl acetate sponge that holds water as much as 10 times its weight, and can do so for up to 15 days before needing maintenance via moistening with distilled water. It also features multiple openings for water vapor to escape in dry climates.

Specifications:

• Weight: 0.32 oz
• Suspension: Held By Strings
• Longevity: Long

Pros
The sponge's water holding ability gets a lot of praise, resulting in reliable and mess-free operation. Many also appreciate its digital screen, which makes checking for humidity and temperature a breeze. Many guitarists also commend it for being reliable, some even report that it works great even through long winter weather.

Cons
Speaking of working well, owners caution that to make the most of the OH-30, you have to be diligent in checking and doing regular maintenance. Some suggest checking it more often on the first few weeks to get the feel of when you need to do maintenance, take note and follow the schedule accordingly. Note that there are some snug-fit cases that may push the unit too far into the soundhole, some users decided to reduce the foam padding right above the humidifier to make it better fit the case.

Overall
This is a great all-in-one solution for keeping your guitar safe from humidity problems.