This is accomplished by using a moisture analyzer.
    Moisture analyzers, generally speaking, are devices that heat a product and weigh it while it heats up.  As the heat of the object increases, the moisture inside it evaporates.  The difference in the object’s weight from the start to the finish of the process can then be evaluated as a representation of how much moisture was in the object to begin with.
    Let’s examine a particular moisture analyzer and how it works.  In this case, we’ll look at the Torbal AGS50.  Assume that we wish to measure the moisture content of a particular brand of almonds.  First we would take the number of almonds we wished to measure and ground them to a powder.  Then we would place this powder into the pan of the AGS50, tare the device, ensure that the powder is evenly distributed across the pan surface, and then close the drying chamber.
    The moisture analyzer then heats the powdered almonds and weighs them as the moisture evaporates from them.  The starting weight, ending weight and temperature of the powder is displayed on the analyzer’s screen.  The process can be ended manually, or automatically when a predetermined time or weight is reached.  At the end of the process, the percentage of the powder that was moisture is displayed on the screen.
    The AGS50 can be used to measure the moisture content over a hundred substances, from active carbon to whole milk.  The accuracy of this analyzer can be tested from time to time using sodium tartrate dihydrate, which has a theoretical moisture content of 15.66%.  Moisture analyzers get very hot during the analytical process, owing to the heat generated by the halogen bulb.
    Moisture analysis is a very important part of some manufacturing processes, and it is important for manufacturers to avail themselves of the best moisture analyzers they can afford.