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Maybe you need to buy a thermo-hygro meter from dick smiths or the like. I assume that having a water bowl in the enclosure(with water in it) ensures that the humidity will be over 50% as the water will evaporate due to the heat, but by evaporating it will increase the humidity. if it is moved to the warmer end it will evaporate faster and should increase the humidity levels. To what amount it changes could be a good experiment. Keep an eye on the water level and make sure it doesnt get too hot as they like to cool of in the water. I havent measured the humidity yet but i will now.
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