The two numbers that measure your blood pressure are written like a fraction: one number on top and one on the bottom -- for example, 128/82. Systolic blood pressure measures the pressure inside your blood vessels at the moment your heart beats. The number on the bottom is your diastolic pressure.
Ginny Weasley's wand is made of yew wood with an unknown length and core materials. The wand was manufactured by Garrick Ollivander sometime before Ginny began her education at Hogwarts School of Witchcraft and Wizardry. Ginny conjuring a horse Patronus with her wand.
A precision wand is moved across your skin with light pressure. The roller used on the end of this wand is filled with microscopic needles that create the channels. The wand also has space for a cartridge that contains your chosen serum. The end of the wand uses vacuum pressure to pull the skin onto the needles.