Tea-coffee moisture meters measures the moisture level in the tea or coffee. The two metal probes of a tea or coffee moisture metre are typically inserted into the tea or coffee beans. The electrical resistance between the probes is then measured by the metre to ascertain the amount of moisture in the tea or coffee. The probes are commonly composed of stainless steel or nickel-plated brass. Tea-coffee moisture meters are a portable tool used to assess the moisture content of beans, including chocolate and other types.