<Ul> <Li> Fire meters are a specialized type of turbine meter meeting the high flow rates requirements for fire protection . They are often approved by Underwriters Laboratories (UL) or Factory Mutual (FM) for use in fire protection . </Li> <Li> Fire hydrant meters are a specialized type of portable turbine meter attached to a fire hydrant to measure water flowing out of the hydrant . The meters are normally made of aluminium to keep their weight low and usually have a 3" capacity . Utilities often require them for measuring water used on construction sites, for pool filling, or where a permanent meter has not yet been installed . </Li> </Ul> <Li> Fire meters are a specialized type of turbine meter meeting the high flow rates requirements for fire protection . They are often approved by Underwriters Laboratories (UL) or Factory Mutual (FM) for use in fire protection . </Li> <Li> Fire hydrant meters are a specialized type of portable turbine meter attached to a fire hydrant to measure water flowing out of the hydrant . The meters are normally made of aluminium to keep their weight low and usually have a 3" capacity . Utilities often require them for measuring water used on construction sites, for pool filling, or where a permanent meter has not yet been installed . </Li> <P> A compound meter is used where high flow rates are necessary, but where at times there are also smaller rates of flow that need to be accurately measured . Compound meters have two measuring elements and a check valve to regulate flow between them . At high flow rates, water is normally diverted primarily or completely to the high flow element . The high flow element is typically a turbine meter . When flow rates drop to where the high flow element cannot measure accurately, a check valve closes to divert water to a smaller element that can measure the lower flow rates accurately . The low flow element is typically a multi-jet or PD meter . By adding the values registered by the high and low elements, the utility has a record of the total consumption of water flowing through the meter . </P>

What effect does the meter in the charge of the light bridge have on the reader