Energy is measured by an energy meter. The resistance is measured by a conductivity meter. One millimeter of rainfall is the equivalent of one liter of water per square meter. SWR is usually measured using a dedicated instrument called an SWR meter. The sight came calibrated for ranges between in meter increments. The result is expressed as a number in units of kilograms per square meter. This is equivalent to 0.86 W per square meter. This applies to both the sound level meter itself as well as the associated calibrator. The chlorophyll maps show milligrams of chlorophyll per cubic meter of seawater each month. This is indicated by the level of an idol's tension meter. These are the vane meter and the hot wire. This is generally done by placing a resistor in series with the meter coil. The atmosphere contains 1 nanogram of selenium per cubic meter. They average half a meter per year of new growth. Batteries were only needed for the exposure meter and LCD.