Calibrating Wet Bulbs?

[SterlingAcres]

Maybe I'm using the wrong word...
I looked for that thread for hydrometers and can't find it. I've got a large redwood chest incubator. I'll be setting 24+ EE eggs this week and I want to double check the humidity. It's got an original Taylor Wet Bulb inside it, that's screwed tight to the temp/hydro frame. You can see it here , even though it's a crappy picture. How's it possible to make sure it's accurate? Or should I just go ahead and grab a cheapy hydrometer from the petshop?

Anyone? Thanks in advance.

 

[ginbart]

If it were me, I would get a cheapy hydrometer from the petshop or Wal Mart. Better to be safe than sorry.

 

[PurpleChicken]

I don't believe (I am no expert) that you can calibrate a wet bulb setup.

My Brinsea has what they call a wet bulb. It consists of two regular mercury
thermometers. One is covered with a wick/sock that stays wet (you add water).
The wet thermometer reads a lower temp based on humidity in the bator.

I use both types but I trust the wet bulb a lot more.