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2. Rain sensor - Wikipedia

   en.wikipedia.org/wiki/Rain_sensor

   Rain sensor on the windshield of a car. A rain sensor or rain switch is a switching device activated by rainfall. There are two main applications for rain sensors. The first is a water conservation device connected to an automatic irrigation system that causes the system to shut down in the event of rainfall.

3. Dropsonde - Wikipedia

   en.wikipedia.org/wiki/Dropsonde

   Dropsonde delivery system on a NOAA P-3 Hurricane Hunter. A dropsonde is an expendable weather reconnaissance device created by the National Center for Atmospheric Research (NCAR), designed to be dropped from an aircraft at altitude over water to measure (and therefore track) storm conditions as the device falls to the surface.

4. Present weather sensor - Wikipedia

   en.wikipedia.org/wiki/Present_weather_sensor

   The present weather sensor (PWS) is a component of an automatic weather station that detects the presence of hydrometeors and determines their type (rain, snow, drizzle, etc.) and intensity. It works on a principle similar to a bistatic radar , noting the passage of droplets, or flakes, between a transmitter and a sensor.

5. Hunter Boot Ltd - Wikipedia

   en.wikipedia.org/wiki/Hunter_Boot_Ltd

   A private consortium led by Lord Marland of Odstock and comprising Peter Mullen, ex CEO of Thomas Pink, and Julian Taylor, all of whom were previous shareholders in Hunter Rubber Company, supported by the Pentland Group plc, bought Hunter out of administration and Hunter Boot Ltd was born. [20]

6. Passive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/Passive_infrared_sensor

   The plastic window reduces the chance of foreign objects (dust, insects, rain, etc.) from obscuring the sensor's field of view, damaging the mechanism, and/or causing false alarms. The window may be used as a filter, to limit the wavelengths to 8-14 micrometres, which is closest to the infrared radiation emitted by humans.

7. Hygrometer - Wikipedia

   en.wikipedia.org/wiki/Hygrometer

   A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much of it is water vapor. [1] Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed.