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Enabling better global research outcomes in soil, plant & environmental monitoring.


The Model 6210L has a converging field of view and is field-focusable from a small spot size focus of 2 mm to a four degree field of view. The standard Model 6210L has a USB cable so that the saved values may be downloaded into the software provided with the Valitec DataReady Data Logger that is embedded in the Model 6210L.

This same data logging/acquisition system is available with the Model 6110L as an option if the larger field of view is desirable. This embedded data logger will store up to four million readings.

These particular instruments have the same features that the AGRI-THERM II has, plus another that makes them the ultimate infrared thermometers for measuring temperatures outdoors: The capability to read the Surface Temperature, the Ambient Air Temperature (the Dry Bulb Temperature) and the Differential of these two readings.

One standard feature on this instrument is the SKY-SPY™ System. To increase the accuracy of the AGRI-THERM III™, the SKY-SPY™ has been added to the original sensor. Errors from 1-2°C can result when an infrared sensor is calibrated indoors and then used outdoors. This is because the cold sky reflects off of the target’s surface and into the temperature sensor. This reflection combines with the target’s radiation signal, causing an error. This error is dynamic and unpredictable and can vary from 0.5°C to 2.0°C in a matter of minutes. For this reason, the SKY-SPY™ is vital to the accuracy of this particular sensor.

The AGRI-THERM III™ also incorporates the TTL/SLR Intra-Optical Light Sighting System wherein a light goes directly through the infrared optics, illuminating the exact target area being measured. The sighting of the actual target is not possible with conventional infrared thermometers. Since the infrared signal beam is not visible to the human eye, this light sighting feature is necessary to be sure that the target is being measured and not the target and the background. All infrared thermometers average the temperature of the first thing they see. With the TTL/SLR Intra-Optical Light Sighting, it is possible to know exactly what the thermometer is seeing.

The VARIO-ZOOOM™ Field-Variable-Focus System allows the operator to change the field of view of the infrared thermometer in the lab or field. This is accomplished by simply pulling the optics out or pushing them in. The TTL/SLR Intra-Optical Light Sighting will indicate when the instrument is in focus when the target spot size is clear. The optics will remain where they are focused as there are two rubber gaskets constraining their movement.


Temperature Measurement

Scale Range: -40°C to 100°C
Resolution: 0.1°C
Accuracy: ±0.25°C from 0°C to 50°C; ±0.5°C from -40°C to 0°C and 50°C to 100°C
Repeatability: ±0.1°C
Temperature: All functions in °C, corresponding to voltage output.
Noise Effective Temperature: <0.1°C
Temperature Measurement Modes: Surface temperature, ambient dry bulb temperature and temperature differential (U.S. Patent No. 4,301,682)

Optical Considerations

Optical Configuration: Robust, aerospace-quality, double-coated zinc selenide optics.
Per Military specification MIL-C-13508
Spectral Pass Band: 8 < wavelengths < 14 microns.
Sighting: TTL/SLR intra-optical light sighting: visible light illuminates field of view (Patent No. 4,494,881)
Illumination Source: Light emitting diode.
Field of View: Variable from 4° down to 2mm using the VARIO-ZOOOM™ Field-Variable-Focus. (Patent No. 7,355,178)
Display: Numeric liquid crystal display on rear panel.

Operating Conditions

Operating Environment: -20°C to 65°C (+14°F to 150°F), up to 99% relative humidity, non-condensing.
Storage Temperature: Same as operating environment temperature.

Electrical Interface

Power Source: Rechargeable nickel metal hydride batteries, 10 hours continuous use on a full battery charge.
Output Signal: Analogue Millivolt (-400mV to 1000mV at 10.0mV/°C)


Response Time: <1 second.
Emissivity Compensation: Settable from 10% to 99% on rear panel.
Sky Radiation Detection/Correction: Standard SKY-SPY™ system for detection and correction of unwanted sky reflection (U.S. Patent No. 4,420,265)
Operating Distance: 2cm to infinity.
Embedded Data Logger (Optional): Custom made data logger; easy USB connection; data compatible with Excel.
Warranty: One-year limited warranty on parts and labour.