I like the look of those hygrotherms but I can't get them in the UK, they won't fit the plugs and can't use an adapter for them either. In a way they're more dangerous than nothing for beginners as they'll pay more attention the hygrometer than the tank itself and if the hygrometer is wrong then they might mist too much or not enough. As a rule, I keep most phibs moist but not wet and I usually mist tropical animals daily and sub-tropicals every other day but I guess it will depend on what heat source your using but if it looks dry then just mist but don't soak the tank.