Campbell Scientific now offers the new TB4MM Hydrological Services tipping-bucket rain gage in addition to the TB4 and CS700. The new TB4MM is a metric version of the TB4, and measures rainfall in 0.2-mm increments instead of 0.01-in. increments. As with the other Hydrological Services rain gages, the TB4MM includes a siphoning mechanism that allows the rain to flow at a steady rate regardless of rainfall intensity. The siphon reduces typical rain-bucket errors and produces accurate measurements over a range of 0 to 700 mm/hr.