Zeroing of the PID was completed before and after calibration.
The Probing Company is Atlanta, Georgia's most experienced Geoprobe Direct Push Services contractor (www.TheProbingCompany.com). Their operators have worked on at least 1,000 environmental sites. They don't just work in the environmental field, they know environmental sampling. Their direct push service area covers Georgia, Alabama and Tennessee and their Professional Geologist sampling team can conduct soil, groundwater and soil gas sampling nationwide.