The Gill Instruments MaxiMet standard series is an ultra-compact, all-in-one solid-state meteorological station suite engineered for reliable, continuous monitoring across land-based infrastructure. Designed to replace cumbersome, multi-component weather stations, the MaxiMet integrates precision sensor arrays into a single, aerodynamic housing. By removing mechanical cups, wind vanes, and tipping buckets, the series eliminates physical wear, freezing failures, and the need for frequent site maintenance, making it perfect for remote or uncrewed installations.
Because land-based applications range from basic wind tracking to full agricultural micro-climate modelling, the standard MaxiMet series is broken down into modular, parameter-specific hardware profiles. This allows you to match your exact data requirements without paying for unnecessary sensor hardware. Whether you need a dedicated ultrasonic wind cell, a pure thermodynamic grid, or a complete weather array paired with optical rain tipping and integrated GPS tracking, the MaxiMet range offers a plug-and-play drop-in solution.
Select a model configuration below to view comprehensive wiring schemas, integrated parameter arrays, and technical data sheets:
The MaxiMet GMX200 is an ultrasonic wind speed and direction sensor with an electronic compass. This enables the unit to provide apparent wind measurements, average speed and direction together with WMO averages and gust data is also provided. The optional GPS also provide compensated wind speed and direction readings, making the instrument ideal for wind monitoring on vehicle and vessels. The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX240 is an ultrasonic wind speed and direction sensor with an optical rain sensor and electronic compass. This enables the unit to provide apparent wind measurements, average speed and direction together with WMO averages and gust data is also provided. The optional GPS also provide compensated wind speed and direction readings. The optical rain sensor provides a good indication of rainfall levels, where low maintenance is required, or space is limited. The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX300 is a Compact Weather Station. The sensors are mounted inside three double louvered, naturally aspirated radiation shields, taking Ambient Temperature, Relative Humidity and Barometric Pressure Readings. Calculated Dew Point, Wet Bulb and Heat Index readings can also be provided via the RS232, RS422, RS485. SDI12, NMEA and Modbus output strings.
The MaxiMet GMX301 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of ambient temperature, humidity, pressure and solar radiation, with no moving parts. The results are high performance across each measurement over long periods of time. The data is output in serial formats - RS232, RS422, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX400 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of ambient temperature, humidity and pressure, and precipitation, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX500 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity and pressure, with no moving parts. The results are high performance across each measurement over long periods of time. The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX501 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure and solar radiation, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX531 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure, solar radiation and rainfall utilising an external tipping bucket rain gauge (included). The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX550 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure and rainfall utilising an external tipping bucket rain gauge (not included). The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX551 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure, solar radiation and rainfall utilising and external tipping bucket rain gauge (not included). The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The MaxiMet GMX552 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity, pressure and heat stress, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and Modbus. This unit is ideal for construction sites, sporting events or where extreme conditions may pose a danger to those in the area.
The MaxiMet GMX600 is a combined instrument mounted inside three double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity and pressure, and precipitation, with no moving parts. The results are high performance across each measurement over long periods of time.The data is output in serial formats - RS232, RS485. SDI12, NMEA and MODBUS.
The brand new MaxiMet GMX603 is a compact weather station with a double louvered, naturally aspirated radiation shields for the measurement of wind speed and direction, ambient temperature, humidity and pressure, and precipitation, with no moving parts. The results are high performance across each measurement over long periods of time. The data is output in serial formats - RS232, RS485. SDI12, NMEA and Modbus,
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