The AGRI-THERM II™ is a non-contact infrared thermometer that is used extensively in agronomy and environmental science research. It is capable of measuring surface temperatures of crops or individual leaves and reading out that temperature, ambient dry-bulb air temperature and the difference between them. This instrument has been used for years by researchers to determine irrigation scheduling and has helped to increase crop yield while saving a vital resource, water. The culmination of the AGRI-THERM II™ has been possible because of the concentration by Charles E. Everest on the design and development of low-temperature dynamic infrared thermometers.
The Everest Interscience AGRI-THERM II™ (100L) is a handheld, non-contact infrared thermometer that is used extensively all over the world to measure temperatures of targets in the natural environment. This natural environment infrared thermometer has differential temperature measurement capabilities. The AGRI-THERM II™ can measure the surface temperature of an object, the ambient air dry bulb temperature and the differential temperature (Patent No. 4,301,682) between these two readings which is so important when taking temperature measurements in the natural environment.
These handheld, non-contact infrared thermometers can be variably focused to measure from 2 degrees to 20 degrees with Everest's Vario-Zooom™ focus option (Patent No. 7,355,178). The AGRI-THERM II™ has Variable Focus, Variable Field of View and Variable Target Spot Size. They can be used to measure surface temperatures of objects from the size of a single pine needle to a crop canopy.
As outlined in the specifications for the AGRI-THERM II™ it has a temperature range of -40 degrees C to 100 degrees C or -40 degrees F to 200 degrees F with accuracy of plus/minus 0.5 degrees C or 1.0 degree F with tenth degree resolution.
Also, if Everest's patented TTL/SLR (Through-The-Lens/Single Lens Reflex) Intra-Optical Light Sighting (Patent 4,494,881) is incorporated into the infrared thermometer, a flashing, safe LED light is projected directly through the infrared optics, illuminating and pinpointing the exact target that is being measured.
Everest Interscience has concentrated on research and development of extremely accurate low-temperature infrared thermometers for the natural environment from its inception in 1980. The designer, Charles E. 'Gene' Everest, has been given awards on numerous occasions for his career accomplishments.
In 1984 Charles Everest was awarded the prestigious International Kermit Fischer Award for the 'conception, design and implementation of an infrared thermometer for the field of environmental science' by the Instrument Society of America. The American Society of Agricultural Engineers awarded Mr. Everest one of their AE 50 Awards for three years in a row, starting in 1987.
Mr. Everest was named a Fellow Member in the Instrument Society of America in 1991 for the 'design and development of low-temperature infrared thermometers for medical and agricultural applications.' Also in 1991, he received First Place from DESIGN ENGINEERING for the 'Most Innovative Product of 1991.'
All of his dedication to the design and development of precision, low-temperature infrared thermometers has led to an extremely accurate method of measuring surface temperatures in the natural environment. This is extremely difficult when the temperature of the infrared thermometer and the temperature of the target are at, or close to, the same temperature, as the infrared signal is so slight in this situation.
The AGRI-THERM II™ has been used extensively worldwide to measure crop canopy temperatures in an attempt to control irrigation. They have been used in studies involving the Crop Water Stress Index (CWSI) and the Stress Degree Day (SDD) concepts. The goal is to improve crop yields while reducing the amount of irrigation needed. More information on this subject can be read in M. B. Kirkham's book, Principles of Soil and Plant Water Relations, 2004.
The infrared thermometers are capable of taking surface temperature measurements in a highly dynamic environment such as having the thermometer taken from an air conditioned truck into the heat of the desert without giving them time for equilibration before taking the measurements. Under these environmental conditions, they respond with accuracy of plus/minus 0.5 degrees C or plus/minus 1.0 degree F.