ZZ array can only be used by FlashRES resistivity meter. the array collect 256 AB pairs in express mode, with each current AB injection measure 61 voltage data. In 20 minutes, ZZ array can collect 15,616 data points. Operator can set the On and Off time to reduce the data collection data even less. FlashRES-64 can only use ZZ array, where FlashRES-UNI can collect ZZ array and all the other traditional arrays.