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Notably, our results revealed that even low-cost chlorophyll meters such as the atLEAF CHL PLUS and PhotosynQ MultispeQ V1.0 can provide similar (and in some cases, stronger) relationships with destructively-determined LCC when compared with well-established instruments such as the Konica Minolta SPAD-502+ and Opti-Sciences CCM-200. In the case of the atLEAF CHL PLUS, this is despite the fact that the instrument does not clamp the leaf (which could allow the ingress of ambient light and slight movements of the leaf). Similar results were presented by Zhu et al. (2012), who found atLEAF CHL PLUS measurements demonstrated no significant effects associated with irradiance or time of day.

Luke A. Brown , Owen Williams, Jadunandan Dash
School of Geography and Environmental Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK

...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