Electrical impedance spectroscopy (EIS) has been an interesting
technique for in vivo assessment of the condition of plant tissues.
The advantage of EIS is its capacity for easily and rapidly performing
measurements. There have been many studies of the use of EIS on
agricultural products. For example, the extent of tissue damage
associated with apple bruises was successfully evaluated (Jackson
and Harker, 2000). EIS was also used as a technique to determine
the ripening of fruit (Harker and Dunlop, 1994; Harker and