MDT modular formation dynamics tester: The MDT™ modular formation dynamics tester takes real-time flowline resistivity measurements at the probe module. It discriminates between formation fluids and filtrate from water- and oil-based muds—excluding formation fluids from sample recovery until an acceptably low level of contamination can be recovered. The faster collection of high-quality, representative samples gives you real-time understanding of hydrocarbon properties at reservoir PVT condition