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...the Minolta SPAD-502 costs about $2600.00. In contrast, the atLEAF is a relatively new chlorophyll meter which can be purchased for one tenth of the cost... We found that the relative chlorophyll reading from SPD-502 and atLEAF meters were highly correlated both to one another and to chlorophyll content determined with spectrophotometry.

A.Gallinat, L. Garrison, R. Primack
Professor richard Primack's Lab at Boston University

The average AtLeaf chlorophyll index reading of the penultimate leaves was closely correlated to the tissue N concentration of those leaves and served as a good predictor of the eventual protein content of the grain.

M. Lundy, S. Wright, Farm Advisor, S. Orloff, UC Cooperative Extension; R. Hutmacher , UC Cooperative Extension Specialist, UC Davis Plant Sci. Dept. and Director, UC West Side REC;