M_meter -
Name applied to a class of instruments that measure the liquid water content of the atmosphere.
Magneto anemometer-
A cup anemometer with its shaft mechanically coupled to a magneto.
Magnetograph -
A recording magnetometer.
Magnetometer-
General name for an instrument that measures the earth's magnetic field intensity.
Magnetron-
A self-excited oscillator used as a radar transmitter tube.
Manometer-
An instrument for measuring differences of pressure.
Marine barometer-
A mercury barometer designed for use aboard ship.
Marine radar-
Radar of the type used on ships, can be employed to image ocean waves, to determine their directional spectrum,
and also to determine ocean currents by their propagation speed.
Marvin sunshine recorder -
A sunshine recorder of the type in which the timescale is supplied by a chronograph.
Maximum thermometer-
A thermometer so designed that it registers the maximum temperature attained during an interval of time.
Mercury barometer-
A glass manometer, employing mercury in its vertical column, that is used to measure atmospheric pressure.
Mercury in glass thermometer-
A common type of liquid-in-glass thermometer used, in meteorology, in psychrometers and as a maximum thermometer.
Mercury in steel thermometer-
A liquid-in-metal thermometer in which mercury is enclosed in a steel envelope.
Mercury thermometer-
A liquid-in-glass thermometer or liquid-in-metal thermometer using mercury as the liquid.
Mesosphere–stratosphere–troposphere radar-
A type of wind profiler designed to measure winds and other atmospheric parameters up to altitudes of 100 km or more.
Metallic barometer-
All-metal barometer; synonym for aneroid barometer.
Microbarovariograph-
Sensitive barometer used to record continuously on an enlarged scale the short period variations of pressure.
Micropluviometer-
A rain gauge capable of measuring very small amounts of precipitation, amounts that are less than could be measured by an ordinary rain gauge.
Microwave radar-
A type of radar that employs microwave scatterometers deployed aboard aircraft and satellites that can compute wind speed using algorithms relating
the wind speed to the backscattering cross section.
Microwave refractometer-
An instrument that measures the refractive index of air by determining changes in humidity.
Minimum thermometer-
A thermometer that automatically registers the lowest temperature attained during an interval of time.
Mirror nephoscope -
A nephoscope in which the motion of the cloud is observed by its reflection in a mirror.
