GSI continues to keep it’s Geoprobe fleet up to date. Taking delivery of Geoprobe 6620DT. After a complete refurbish, the Geoprobe 6620 returns to GSI better than new. Complete restoration with the addition of all the modern upgrades makes this workhorse better than when it was brand new. The 6620dt will compliment our fleet of Geoprobe 7822 machines, as well as our truck mounted machines.