Spectralab Model NT 2000 Turbidity Meter is the most advanced portable Microcontroller based Turbidity meter. It is based on nephelomatric and ratiometric principles of turbidity measurement. It uses LED & meets EPA 180.1 and ISO 7027 as well as an infred ratio ( IR ratio ) mode that gives results in accoradance with EPA GLI method 2. It has a memory to store 40 results. The data can be tranferred to PC & then prontouts can be taken in a document format with report number, data & time.