Though it is good to have a hyrgometer for a rough idea of humidity(more for min required humidity), ALL snakes are different. And youll this on his/her shed, My female pied, will do perfect sheds from lowest to highest humidty where my Lavender spider, needs min 75-80% to have a good shed, so shes my only girl on cocohusk, So use them as a guideline but do not hold all to them, Youll learn your snake after one or two sheds, and work from there!