Meteorological sensor that records pressure and temperature. The measurement frequency of this sensor is 1Hz, and the data held at CEDA has a frequency of 5 minutes.

For the purposes of the Snowdon Mountain Railway GNSS experiment, they were mounted at two co-located static GNSS reference stations at the base of the railway at Llanberis (SNLB) and at the summit (SNSU).

This instrument was operated by Newcastle University.