The PSR+ The Ultimate Portable Spectroradiometer

The NEW PSR+ Series of spectroradiometers features a new standard for remote sensing applications in the field. Our sleek, compact design results in an full range NIR agricultural spectroradiometer that’s easier to handle and operate – there’s no better instrument for field work whether you are ground truthing satellite or flyover hyperspectral data, engaging in vegetation studies, performing canopy research, studying crop health and climate change, doing soil analysis – potential applications are virtually endless.

The PSR+ not only looks and feels great, we’ve also enhanced performance and reliability. System cooling has been enhanced with the new unibody anodized aluminum chassis with integral heat dispersion channels. Our new proprietary Sotex™ filter technology delivers improved order sorting for enhanced stray light performance and smoother transition between detectors.


ModelPSR+ 3500 Portable Spectroradiometer
Spectral Range350–2500nm
Spectral Resolution - FWHM (Full Width at Half Maximum)3 nm @ 700 nm
8 nm @ 1500 nm
6 nm @ 2100 nm
Spectral Sampling Bandwidth1.5 nm @ 700 nm
3.8 nm @ 1500 nm
2.5 nm @ 2100 nm
Si Detectors512 element Si array (350–1000nm)
InGaAs Detectors (TE-cooled)256 element extended wavelength photodiode array (970–1910nm)
256 element extended wavelength photodiode array 1900-2500nm)
Direct Attached FOV Options4°, 8°, or 14° lens, 25° fiber optic, diffuser, integrating sphere
Fiber Mount Options1,2,3,4,5,8, and 10° Lenses
Noise Equivalence Radiance 0.5x10-9 W/cm2/nm/sr @400nm (4° lens)0.5x10-9 W/cm2/nm/sr @400nm
0.8x10-9 W/cm2/nm/sr @1500nm
1.0x10-9 W/cm2/nm/sr @2100nm
Max Radiance @ 700nm (4° lens)1.5x10-4 W/cm2/nm/sr
Calibration Accuracy (NIST Traceable Radiance)±5% @ 400nm
±4% @ 700nm
±7% @ 2200nm
Minimum Scan Speed100 milliseconds
Wavelength Reproducibility0.1nm
Wavelength Accuracy±0.5 bandwidth
Communications interfaceUSB or Class I Bluetooth– laptop or PDA compatible
Size8.5” x 11.5” x 3.25”
Tripod mounting2 each ¼-20 mounting holes provided
Weight7 lbs (3.5 kg)
BatteriesPSR+ comes with two lithium ion batteries (only 1 used at a time); 7.4V
Battery OperationRemovable battery; typically 4 hour operation per battery
On board memoryStorage of 1000 spectra in standalone operation

Application of PSR+3500 Spectroradiometer

  • Vegetation studies
  • Ground truthing
  • Environmental research
  • Forage analysis
  • Soil analysis
  • Analysis of plant health
  • Estimation of grass chlorophyll
  • Microbial diversity research
  • Plant species identification
  • Forestry studies
  • Measuring biomass