The longitude (abbreviation: Long., Î», or lambda) of a point on the Earth's surface is the angle east or west from a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses (often improperly called great circles), which converge at the north and south poles.
Use the dual thermometers to calculate relative humidity. Fisher Scientific Mason's Hygrometer has one dry thermometer and one wet thermometer which provide temperature readings for determining the relative humidity.
Fisher Scientificâ¢ Memory Humidity/ Temperature Pen. Memory displays highest and lowest humidity/temperature reading achieved overnight or during any time period. Fisher Scientific Memory Humidity/Temperature Pen continuously and simultaneously displays both relative humidity and Â°F/Â°C with dual recall memories.