Data logging for up to 5,000 measurements composed by value and associated species name. * Windows compatible software and USB data cable. * Canadian Journal of Soil Science found "Equivalent performances were observed for SPAD and atLEAF values in different environments regardless of crop species. Therefore, the atLEAF Chlorophyll meter can be used as an inexpensive alternative to the SPAD-502 meter." Without the $2500+ price tag. * Easily convert units to SPAD units if needed. * Great indication of nitrogen update and plant health.