# Is there any good way to measure humidity constantly in a concrete block?

So, there is this teacher who wants to test how an chemical compound acts in the velocity of drying in concrete. Basically, i want to measure continuously (it would be great if i could do it with an arduino) the humidity level in a block of concrete. What is the best option? To use a air humidity sensor (DHT22, for example) or an ground humidity sensor? Or any other better option? The main purpose here is to store every measure of humidity along approximately 12 ou 13 hours. Any ideas? Thanks!

• Hey, thanks for the answer. I came up with this idea to the teacher, but she said that the recipient will be closed and the water will not actually evaporate, but disappear in chemical reactions in the concrete. So we cant use a scale. Arent there any other options? if not, how can we calibrate the readings? Thanks! Oct 26 '16 at 10:25