I first read about EDI Exploration Drilling International GmbH when my girlfriend read the “VDI news” this weekend. I saw the picture of a nice drill rig, and instantaneously I was reminded about my drilling days, and hooked (great layout! :-)).
It seems like those EDI guys had a pretty smart idea: the “fluid finder”. On the picture this thing looks like a Waterloo Profiler, but bigger. They put it just above the bit when they drill mud rotary. It saves time when they want to pump water out of the hole: They don’t need to jack all the drill rods out of the hole, but can just drop a pump inside the drill rods, and use the “fluid finder” as a screen. According to the VDI-article, it seems like it’s mostly used for exploratory holes. I think it can save time and money, but I’m not sure how valuable it is for scientific / environmental projects. Although unfortunately, I’ve never seen it live.