Portable turbidity meters include versions based ISO and EPA methods. Meters based on the EPA method display results as NTU. A portable meter based on the EPA method is also available to measure chlorine. Meters based on the ISO method display results as FNU. In this category are portables that can measure additional parameters along with turbidity and a version made for bentonite monitoring in wine and haze in beer. The haze meter that can display results as FTU, EBC, ASBC, and HELM.