Manual data logger has capability of reading all models of ER probes manufactured by this company (P.Z.D). Advantages of ERT-01 include low weight, easy transportation, and resistance against atmospheric factors (dust and rain). its keyboard and software are designed to have the least sophistication to be easily used by users. It can also be used to download corrosion data from the field mounted data logger. In order to protect the data logger from possible shocks, a leather sheath has been considered, which can be provided upon customer’s request.