The shape is based on the extremely successful SBS aluminium rain gauge, also manufactured by EML. The difference between the two gauges is that the ARG314 takes advantage of improvements in injection moulding techniques, and is therefore manufactured in a highly robust UV-stabilised plastic, which reduces the cost to the user. The ARG314 is precision-engineered to minimise out-splash and reduce rainfall losses caused by evaporation. The depth, diameter and angle of the funnel have all been extensively tested and research to give optimum accuracy in the field and comply with WMO standards.