The HLD01 single-phase watt-hour meter is the latest development in the range of Ferraris type induction meters. The meter has been designed in a modular construction allowing for fewer components with the benefits of reduced cost and increased reliability. Servicing costs have been kept to a minimum due to the construction design, and the wide measuring range ensures accurate measurement at both low and high loads. The HLD01 meter enables electricity supply authorities to install the meter with total confidence, realizing these expected high peak loads, while at the same time accurately recording low consumption at off-peak periods. A long and trouble-free service life is guaranteed by a state of art design concept, specialized finishing of components, and high stability of the brake magnets. Outstanding advantages are the moving element, the non-lubricating register mechanism, the robust measuring assembly and the high strength at continuous and surge over voltage stresses. The HLD01 meter has been designed and manufactured in compliance with IEC521 and BS5685.