Rain Gauge 585 This handy heavy duty plastic rain gauge helps you plan your irrigation needs. Easy to read large print measurements in both metric and imperial accurately measure rainfall. And even better, the construction of the rain guage magnifies the printed measurements by a further 35%. The unit can be mounted on a wood post or it can be pushed into the ground with the self contained reinforced spike. Dimensions of the rain gauge are approximately 30 cm (12″) high by 7 cm (2.75″) wide by 2.5 cm (1″) thick. . Rain Gauge $12.99.