"I was studying some leaves," Judy said' "trying to see if they had a suitable chlorophyll content."

The chlorophyll content of leaves can be non-destructively measured using hand-held, battery-powered meters.

The turbidity, chlorophyll content, pH level, and dissolved oxygen levels in the reservoir are sent to the operator of the dam every three hours.

These instruments and scales have been shown correlate to chlorophyll chemical tests for chlorophyll content except at very high levels.

Scientists chose spinach both for its high chlorophyll content, which makes it dark green, and its low price.

The images yield a sensitive measure of the chlorophyll content of the vines, which says a lot about the taste of the fruit.

However, nitrogen deficiency can also be detected non-destructively by measuring chlorophyll content.

A superior method is to measure the chlorophyll content using chlorophyll fluorescence.

Non-destructive, hand-held meters use this effect to measure the chlorophyll content of samples where traditional absorbance techniques cannot be used.

The chlorophyll content of phytoplankton often appears bright green or blue in natural-color satellite images.