tree health calculator - Beta/Experts Program - 2015-2017


2 year development of the Tree Health Calculator methodology during the Beta program and PhotosynQ expert program

This version utilized the 3d printed Multispeq BETA prototype


The One Protocol (Phi2, PSI, NPQ) II

The One Protocol to rule them all! Phi2, PSI, NPQt, combined!

Changes from previous The One protocol: - no longer outputs signal from the far red period, which simplifies the signal output for the user - changed distance between measuring pulses from 10,000 to 2,000 which improves measurement resolution - has an initial stabilization peri...

Chlorophyll content (SPAD) I

REQUIREMENTS: Firmware v0.38 or lower (used for older devices which do not have a SPAD calibration, generally device ID 87 and lower).Measures transmission at 940nm and 650nm in order to determine the 'greenness' of a leaf, an indicator of chlorophyll content and nitrogen content. The 940 is used to account for leaf thickness.


  1. TPA Site Number (Short Answer)
  2. Site Sample Number (Short Answer)
  3. Tree Identification Number (Short Answer)
  4. Genus / Species (Short Answer)
  5. Tree Protection Zone (TPZ) Impact (Multiple Choice)
  6. Age (Short Answer)
  7. Ground Cover (Multiple Choice)
  8. Tree Condition (Multiple Choice)
  9. Pest and Disease (Multiple Choice)
  10. Soil Moisture (Multiple Choice)
  11. Soil Food Web (Multiple Choice)
  12. Brix (Refractometer) (Short Answer)
  13. PHC Treatments (Multiple Choice)
  14. Compaction Depth cm (Multiple Choice)
  15. Leaf Branch Type (Multiple Choice)
  16. Leaf Condition (Multiple Choice)
  17. Diameter at Breast Height (DBH) (Short Answer)
  18. Ambient Temperature (Short Answer)
  19. Canopy Sample Area (Multiple Choice)
  20. Compaction - PSI (Short Answer)



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