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¢ Specific Gravity Hydrometers . Double scales can be read without turning the hydrometer. Measure true specific gravity of liquids. Chemical-resistant bulbs and stems; Streamlined to avoid trapping air bubbles; With directional device that stops the instrument with the scale facing the user for more convenient, more accurate readings; Order Info