The DA Index® or index ΔA is an index of the state of maturation of the fruit based on the difference of absorbance at two wavelengths: one at which has the maximum absorption by chlorophyll-type and a second, used as a reference, chosen to have the minimum change in absorbance during the whole period of fruit ripening.

The value of DA is proportional to the amount of chlorophyll present in the fruit. Since this tends to fall off during maturation, the DA Index® will tend to decrease over time, reaching values close to 0 for fruits already overly ripe for commercial use.
Instrument for the measurement of the DA

The reference values for the collection and consumption vary from species to species ..

How To Use It


The instrument Da-Meter works with all the types of fruit?
13 July 2018
Our instruments work with yellow fruit (peaches, apples, etc.), red fruit (strawberry, amarene) and kiwi.
How to measure ripeness of fruit in 6 simple steps
6 April 2017
So far we already said that the DA-meter is an innovative tool for agriculture: it measures the fruit's ΔA index that is an indicator of its maturation level. However how do you actually ma...
Do you know the DAmeter?
10 March 2017
If you are here you might already know the DAmeter. In case you don't, let me introduce you to this innovative tool. Who needs the DAmeter and why? The DAmeter is a tool for growers,...