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Calibrating your Hygrometer.

Humidity is an important part of incubation but having an accurate humidity gauge is not life an death. Its nice to have an accurate one if you want to debate correct humidity levels with other or if you want to copy someone else's humidity levels exactly. If you just want to incubate then consistency is all that is required.

If you run your humidity at 40% on your gauge an get a great hatch you want to be able to do it again. To do that you want to run that same 40%. Who cares if its actually 40% as long as its the same % as last time.



You do want to start out with as accurate a reading as you can though so heres how to calibrate your gauge.

Wet salts somehow only release moisture in to the air till the humidity reaches a set point then stops. Those points are different for each type of salt.

SALT BATH HUMIDITY
LITHIUM BROMIDE 6.37%
LITHIUM CHLORIDE 11.30%
POTASSIUM ACETATE 22.51%
MAGNESIUM CHLORIDE 32.80%
POTASSIUM CARBONATE 43.16%
MAGNESIUM NITRATE 52.89%
SODIUM BROMIDE 57.57%
POTASSIUM IODIDE 68.86%
SODIUM CHLORIDE 75.30%
POTASSIUM CHLORIDE 84.34%
POTASSIUM SULFATE 97.30%

Sodium Chloride is the salt everyone has laying around. It ordinary table salt. Some salt comes with Iodine added to it. We want plain old table salt that does not contain Iodine.

You take the salt an put it in a bowl an add just enough water to get it wet. You want what feels like wet sand not soup. Then put that bowl an your gauge in a zip lock bag or sealable container an let it set for 6+hours. After that time your gauge should read 75%. If it read high then subtract the difference from all readings from then on out. If it is showing low then you add the difference from here on out. Mechanical gauges can be set with a turn screw in the back.

Now in reality this will only work to get you a perfect humidity reading at 75%. There will probably be some error as you move farther away from 75%. But its close enough for government work. If you want you can also use the above chart to calibrate it at other humiditys if you feel the need.

Explanation of the proses is all well an good but why tell you when I can show you. Heres a video of me calibrating my new humidity gauge.


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