Vertigo - Acoustic Guitar
Humidifier System
Massive 90ml capacity.
No lids, no caps, just add water.
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The revolutionary PET‑1 Acoustic Guitar Humidifier
We’ve taken everything you hate about humidifiers and made them disappear.
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Vertigo - Acoustic Guitar
Humidifier System
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The revolutionary PET‑1
Acoustic Guitar Humidifier
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Combine with humidifier packs for easy maintenance.
Combine with humidifier packs for easy maintenance.
Paul D.
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Reviewed in the United States on July 11, 2021 Size: 3 Pack Verified Purchase

Perfect to combine with the Diodarrio humidifier packs. Those packs maintain the right humidity and these will actually rehumidify those packets. I live in Denver which is a high desert, so it gets really dry here. Combining those two has allowed me to easily maintain my acoustic guitar.
Works great. 💯
Works great. 💯
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Reviewed in the United States on April 13, 2021 Size: 1 Pack Verified Purchase

Have a backup, all wood guitar. I had put in case, and had not touched in months. Pulled it out, and 1st and 2nd sting were fretting out at 11th fret on up. Filled up product, and put in guitar, and guitar back in case. After 4 days, no more fretting out. Plays like the when I bought it. 😁
It really works and so simple
It really works and so simple
Michael Teach
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Reviewed in the United States on July 5, 2021 Color: Black/Blue Verified Purchase

It was exactly as advertised. It was flawless. To this day, I haven't the faintest idea how is works, but I do know that it definitely Works.
As advertised
As advertised
Rhodey Mark
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Reviewed in the United States on December 24, 2020 Color: Red/Black Verified Purchase

Just refilled it after three weeks, and it appears to be exactly as claimed. Left in the soundhole of a guitar that stays out in the heated air, and the guitar seems happy with the process. I was concerned about the Fishman wiring and it sitting near the output jack but it looks like it coexists peacefully with the electronics. I would put this in the case vs soundhole for an enclosed instrument, but if it is a daily player drop it in and forget it for a couple weeks.

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All about humidity

Why should I humidify?

The wood your guitar is made from is a living, breathing material. It slowly absorbs moisture from the air when it is humid, and slowly releases it when it is dry. This causes it to expand and contract, which affects the action (playability), structural integrity and resonance of your guitar, which is why you need to humidify.

How does humidity affect my guitar?

When it is humid, the body slowly swells as it absorbs moisture from the air. Conversely, when it is dry, the body slowly shrinks as it loses moisture to the air. The amount of moisture in the wood is known as moisture content (MC).

What do humidifiers do?
Humidifiers work through the diffusion of water vapor with the air. Lower vapor pressure in the air causes water to evaporate from the humidifier and be absorbed by the air, balancing the vapor pressure throughout. This is known as the process of equilibration. Similarly, wood gains or loses moisture by equilibrating with the air around it, but at a much slower rate. This is good because it means that you don’t need to supplement the humidity all the time – you should only humidify when your guitar needs it.

What is the ideal humidity?

Most manufacturers use tone wood that has been equilibrated to a 50% Relative Humidity (RH) environment. Hence the ideal humidity 
is 50% RH. However, it is the Moisture Content (MC) of the wood we are more concerned about, not necessarily the humidity of the air. Luckily, wood is slow to equilibrate, making it immune to daily fluctuations of high and low humidity. As such, it is a myth that you must maintain an absolute 50% RH continuously. Instead your aim should be to maintain a 
long term average of 45-55% – nominally 50%.

Does temperature affect humidity? 

Humidity is a relative thing, hence the term RH. It is relative to the capacity of the air to absorb moisture in vapor form. As you heat air its capacity increases, causing the relative humidity to drop. This is why, despite having reasonable outdoor humidity, it can feel really dry once the air is heated in your home.

What if I don’t humidify?
If you don’t humidify, you may be playing a game of Russian roulette with your guitar. Changes in MC will affect the action (playability) of your guitar, the resonance of the soundboard, and can even result in structural failures such as failed glue joints, 
as well as cracks in the body.

If I live in a humid climate 
do I still need to humidify?
It really depends. Heating and air conditioning can significantly affect indoor humidity, so you cannot always rely on outdoor humidity as your guide. Ideally you should measure the humidity in the room your guitars live in before making a decision.

Should I humidify all the time?

No, no and no! Only humidify when your guitar needs it. If you humidify all the time you risk adding too much moisture to the wood, which can be as bad as being too dry. Think of it in the same way as heating your home. The furnace only runs when it needs 
to, not all the time.

How should I humidify?
It depends. 
If you keep your guitar out, play often, 
and it was set up professionally, then we’d recommend using the action (playability) of your guitar as your guide of when to humidify and when to stop. Be warned that if you keep your guitar entombed in a case, you must use a fully functional hygrometer and monitor it daily to prevent over humidification.

Moisture Content 
Relative Humidity 

Coming back from the Crack
Seeing is believing
Zen & the Art of Humidity
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Moisture Content. Using your guitar as a hygrometer
 Only humidify when your guitar needs it.
Not all the time.
Too much moisture in the wood can be equally damaging.

Only humidify when you need to

Drop in the humidifier when the action gets too low, and remove it when that sweet action returns.

If you keep your guitar in a case, monitor the humidity inside the sound hole. When it drops below 45% RH you will know it is time to humidify, and when it exceeds 55% RH you will know it’s time to stop.

Finally, don’t be fooled by the outdoor humidity. Relative Humidity is temperature dependent. As such, heated indoor air is often much drier than the air outside.

Feel the Action

In severe cases you can see a dry or swollen guitar just by looking at the profile. But long before you see it, you will feel it when you play.

Too much Moisture Content will cause the bridge to lift, resulting in high action making it much harder to play, while too little, will cause the bridge to sink, lowering the action and causing fret buzz.

The sound of the guitar is also another little tell-tale sign, albeit less obvious. A guitar with the right moisture content will have a fuller sound than one that is overly dry.

The radius of the guitar acts as your hygrometer

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