The NETA has a funnel top and internal measure for the first 250 mm of rain. Any additional rainfall overflows into the main body for later measurement. The design is well thought out to minimise losses due to wind or evaporation. The large capacity means it is suitable for longer unattended operation. - A precision instrument which measures up to 250 millimetres ( approx 10 inches) of rainfall - Ideal for farmers, graziers, teachers, gardeners and nurserymen - Simple to install. Highly accurate.