A hygrometer is a device that measures relative humidity. In photography, we use the hygrometer in a dry box to make sure that the humidity measures between 40-50%, thus dry enough to deter growth of fungus or molds in our lenses, sensors.
I just found out that the hygrometers sometimes give inacurate readings, thus, the need to calibrate them before using it. I was given a link by a friend and member of the Photographic Society of Iloilo, Paul Go, on how to calibrate a hygrometer.
I hope you’ll find this useful… How to Calibrate a Hygrometer
Other related topics… Do-It-Yourself Drybox
December 3, 2009 at 11:55 pm
hi pao!
i would still recommend a hygrometer inside the box because i try to maintain a humidity level between 30%-40%.
very low humidity means it might be too dry and might cause mechanical parts of your camera/lens to loose lubrication. the parts made of rubber may dry out and become brittle & crack. my drybox can get as low as 15% humidity if i have a new dehumidifier.
more importantly, you wont know if your dehumidifier or silica gel is doing its job. if they stop absorbing moisture, then your box becomes one breeding ground for molds & fungus.
here are several shops where you may find a hygrometer:
1. Fuma (located at glorietta, sells cigars). the analog sells for P600 and the digital for P1,200 3 years ago. (price may differ now)
2. DIY Shop (bought mine at greenhills branch). of all places i found one at the car accessory section (see #2 above). relatively cheap at P225 only
December 3, 2009 at 2:07 pm
hi,
i was able to do your DIY dry box already. problem is, i can’t find a hygrometer. you think that is ok?
i would appreciate it if you can email me your thoughts. =) paolosruiz@gmail.com
thank you so much!