Abstract: A measurement device such as a sheet dimension gauge and a method of constructing a gauge which does not require recalibration. The preferred embodiment includes a frame having a transparent top wall with overlaid measurement lines thereon, a measurement guide, a light source, a heater, a thermostat, and a fan. The frame and the transparent top wall are constructed of a material whose dimensions are not susceptible to changes in humidity, but are susceptible to changes in temperature. Therefore, a temperature control system is used during manufacture and operation of the gauge to ensure that the sheet dimension gauge is properly calibrated. A fan, a thermostat, and a heater are mounted within the frame to maintain a uniform temperature inside of the frame slightly above the highest anticipated ambient temperature created by the lights. A one piece measurement guide, which is used to hold the sheet of paper being measured, is rigidly attached to either the frame or the transparent wall.