... .The instrument use a section of 9V-battery to supply energy, this battery can be used for more than 40h ... to 90% relative humidity (noncondensing)Life of battery:1×9V, more than 40hSize:170×70×30mm Weight: ... to 90% relative humidity (noncondensing)Life of battery:1×9V,more than 40hSize:170×70×30mm Weight: ... to 90% relative humidity (noncondensing)Life of battery:1×9V,more than 40hSize:170×70×30mm Weight: ...