to 675 mg m^-2. Gitelson also developed a formula for direct readout of chlorophyll content in mg m^-2. The formula provided a reliable method of measuring chlorophyll content from 41 mg m^-2 up to 675 mg m^-2 with a correlation r² value of 0.95.

Also, the chlorophyll concentration can be estimated by measuring the light transmittance through the plant leaves. The assessment of leaf chlorophyll content using optical sensors such as Dualex