Prolix Music High performance instrument accessories
The revolutionary PET‑1 Acoustic Guitar Humidifier
We’ve taken everything you hate about humidifiers and made them disappear.
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The revolutionary PET‑1
Acoustic Guitar Humidifier
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All of the standard guitar humidifiers on the market suck, as we all know, and for different reasons. This seems to be ok. But I do not yet trust putting this inside my precious, expensive guitars. I’m dinging 1 star for making me unsure. Having said that, it is better than all of the funky attempts out there that I know of. It may just be great.
Reviewed in the United States
December 11, 2020

Kokapelli 108

Amazon Reviewer

I’ve tried a number of guitar humidifiers.
These are the best by far.
They work exactly as advertised and exceed expectations.
Reviewed in the United States
December 1, 2020

Benjamin Broder

Amazon Reviewer

Easy to use, works in the guitar or in the case.
No leak, no water noted after initial soak and dry period.
Works as well as Ddario humidipack and more economical.
Reviewed in the United States
December 23, 2020


Amazon Reviewer

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.
Reviewed in the United States
December 24, 2020


Amazon Reviewer

You may need to soak this a couple of times before it really begins to absorb.
Reviewed in the United States
January 3, 2021


Amazon Reviewer

Absolutely the best hydration system on the market.
I live in the high desert, (very low humidity and high temps) and have tried many humidity systems. Most if not all have to be re hydrated every other day. The Pet-1 holds a lot of water and it lasts about 5 days before I need to re hydrate it again and only needs tap water and 20 min.!
I have bought one for all of my guitars.

Reviewed in the United States
June 27 2020

Mark Gunsolus

Amazon Reviewer

Fantastic idea, TOP NOTCH customer service
I live in Colorado where humidity is an ongoing issue. I was VERY excited to have possibly found a solution that doesn’t require maintenance every few days. As for the product, does what it says. Does not leak, and so far the hygrometer in the case is reading at perfect humidity for the guitar.

Heather K

Amazon Reviewer

I’ve been searching years… for something like this!
In less than 2 days, the PET 1 has brought my RH level to 48%. The ease of use of this item is one of it’s best features.
There is nothing else like this on the market and I wouldn’t buy anything else to humidify my guitar now that I have it.

Reviewed in the United States
May 15 2020

Michael R. - New York

Amazon Reviewer

Great idea!
Never used humidifier before so have not obtained results yet.
I’m hoping it will be easy to remove when it’s time to rehydrate.

Reviewed in the United States
May 14 2020

Jasmine V. - California

eBay Reviewer

Steve, in customer service was available on a Saturday.
Provided excellent advice.
I bought product a second time!

Reviewed in the United States
May 19 2020

Elliott. S - New York

eBay Reviewer

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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 just 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 on how you use your instrument. 
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 (MC)
Relative Humidity (RH)

Coming back from the Crack
Seeing is believing
Zen & the Art of Humidity
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Moisture Content
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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