A portable coordinate measurement machine for measuring the position of an object in a selected volume includes a positionable articulated arm having a plurality of jointed arm segments. In at least one embodiment, the method includes receiving a first signal input indicative of a request that contents of a selected email message be displayed on a display associated with a client computer device, wherein the contents are stored in a memory device associated with a server computer device and include contents of at least one other email message. The invention is applicable in cosmetics, dermopharmaceutics, pharmaceutics, textile industry. The reference voltage is adjustable using coarse as well as fine digitally controlled voltage increments. The magnitude of the delay of the second delayed signal is inversely proportional to the magnitude of the supply voltage to substantially the same degree that the delayed output signal of the first delay stage is proportional to the magnitude of the supply voltage.