In general, they are split into two groups – single parameter stand alone units, or multi parameter integrated units such as the Sensorbee. Single parameter units have portability to enable movement around site as works progress but can often be less cost effective than a multi parameter unit. Multi parameter units are fixed in situ but allow for multiple measurements from a single web platform. NTS will always offer the best solution for your project, but experience tells us that the Sensorbee will be the best, most cost effective solution in 99% of cases.