So, I decided to get a hygrometer and test the humidity in my humidity bin.  90% (i haven't put any plants in it yet). There's no condensation on the sides.

Is that too high? What's your opinion of the perfect humidity level in the humidity bin?

I also tested the humidity in my rooting boxes.  80%.  I'm suprised it's lower. I think I need to get those higher.  thoughts?

one of my cuttings is starting to bud out w/o roots.  it's only been in the box for 2 weeks.

I rechecked my rooting box. It's up to 88% humidity now.

i try to keep it around 70-80%. if it goes too high, i just air it out. too high and you can run into water sitting on the bud leading to possible rot.

Hi Dallasfigs,
The temps of both please .
If temps are on the low, water/humidity is then a bigger problem.
If it is plants that you have in the humidity bin, I would air it more ... But the choice is yours - if you don't the trees will have harder times adapting to the normal air when you'll get them out of the bin.
Is your rooting box completely dark ?
Do you have a photo for the one leafing without rooting ?

James,
Healthiest and fastest root development seems to occur at 85% - 90% RH and 72 deg F to 78 deg F. If you can maintain a temperature of approximately 75 deg F, the humidity within the bin will stabilize and will be easier to maintain at the higher levels.

I don't use humidity chambers for growing out cuttings, but maintaining a lower humidity level, between 65% to 75% may be better than the higher humidity used for rooting.

Condensation on the side of the bin is only indicative of a temperature difference between the outside and inside of the bin, moisture will condense on a colder surface. When its condensing, its decreasing the humidity levels.

Not to nit pick, but to keep information correct.

A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. Such as the salt level in a saltwater aquarium.

Humidity is measured with a hygrometer. 

The temps of both please .  About 72F.  They will be a little warmer as spring/summer progresses.

If temps are on the low, water/humidity is then a bigger problem.
If it is plants that you have in the humidity bin, I would air it more ... But the choice is yours - if you don't the trees will have harder times adapting to the normal air when you'll get them out of the bin. Once they bud out, they will be removed from bin.

Is your rooting box completely dark ? Yes

Do you have a photo for the one leafing without rooting ?  not yet.  If the leave comes out before roots, I think I'll go ahead and put it in a 32oz cup and put in humidity bin w/light.  That should hold it until the roots finally pop out, yes?