In-Situ Inc. introduces the Multi-Parameter (MP) TROLL 9000 for water quality monitoring. Designed with high-quality 316L stainless steel, the MP TROLL 9000 is rugged, yet lightweight. The 1.75-inch diameter probe is offered in several versions and capable of monitoring up to nine sensors simultaneously. The MP TROLL 9000 features "smart" sensors, digital D.O., factory pre-calibrated sensors, flexible sensor ports and more. In-Situ Inc.