1. Get LandMapper Device Request Quote Accuracy>99%Safe & reliable standard:9 V battery PC connected for data transfer LandMapper ERM-03New hand-held geophysical device (field-rigged enclosure, ergonomic design) measuring electrical resistivity & conductivity (RES/EC). Includes: field bag, lanyard, USB cable, user manual, USB drive with software and info LandMapper ERM-04 All of the above + accurate measurement of natural electrical fields (self-potential, SP) in soils and plants via non -polarizing electrodes. 2. Follow Field Procedure Below Manual measuring of electrical resistivity