A delivery vehicle for a silver ion source such as silver nitrate and the like, suitable for use in the treatment of menorrhagia, comprises a plurality of physiologically inert beads bearing a tissue cauterizing amount of a silver ion source. For each virtual machine, the host machine hypervisor categorizes memory pages into memory usage classes and estimates the total number of pages for each memory usage class. The device is tested by connecting two sense contacts of a resistance measuring device to the terminals and measuring the resistance between the sense contacts a first, second and third state respectively, the first and second transistor being switched on and off respectively in the first state and vice versa in the second state, both transistors being switched on in the third state. The first opening is configured to be inserted into a breathing opening in a mask to form a connection with the breathing opening of the mask.