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.
Learning the difference between the two is the best way to determine what your exact needs are and which instrument will best fit those needs. A hygrometer is an instrument thatâs used to measure the level of moisture thatâs in a room. Its sole function is to give the user either a digital or manual read-out. You can either buy a hygrometer as a small unit that operates off of batteries, or a unit that can be placed on a shelf in order to get a quick readout.