Lo que he notado es que tiene que estar cerca del humidificador para que marque la humedad de la guitarra, el plástico es frágil, ya se me cayó 1 vez, de muy poca distancia y dejo de funcionar, le tuve que quitar y poner la pila 3 veces y revivió. Deberían de hacerlo más resistente.

This hygrometer’s small size allows me to put it in my guitar case so I can accurately measure relative humidity. It’s easy to program and use, too.

Chi possiede strumenti come chitarre sa quanto l'umidità dell'ambiente abbia impatto sulla risonanza e sullo 'stretching' che il legno dei nostri stumenti subisce nel tempo. Spesso bisogna ricalibrare il Truss Rod proprio a causa di repentine variazioni di questi parametri ambientali.. Ho trovato questo strumento molto utile per tenere sotto controllo l'umidità. La durata della batteria a mio avviso è sufficiente (dura parecchi mesi) ed il prezzo irrisorio al quale ho avuto la fortuna di pagarlo me lo fa consigliare.

I checked the accuracy of this hygrometer using the Boveda calibration kit, and both of the hygrometers I purchased measured within 1 degree of the test kit. Other hygrometers I've used in my guitar cases were off by 5%. I have one of these in each of my guitar cases along with daddario humidipaks...a must have to protect the guitars from humidity changes.

After receiving the D'Addario hygrometer I decided to check it's accuracy using the salt test (you may Google it to understand more). The idea is to put you hygrometer in the close environment (for example zip bag) along with a wet salt and leave it for 6 to 8 hours. Then you hygrometer reading should be 75% of relative humidity. As you can see on attached photos the D'Addario hygrometer shown 100% accuracy. I was very happy about it. Now I can store my newly bought guitar in the right conditions. Also this hygrometer has a temperature sensor, clock and calendar. It has got a memory function and can show when the maximum and minimum relative humidity has occurred. Great functionality and very easy to use. Highly recommended.