** SIGNAL ** The Electronic Ratio Box is designed to give a permanent fixed ratio signal output from a continuously varying input signal. This could be any variable frequency signal in an automotive, marine or industrial environment, eg/ Speedo – hall effect or transducer, Tachometer – magnetic pick up, alternator or hall effect. The ratio is extremely easy to adjust and may even be performed, if necessary, without workshop instruments by a trial and error method explained in the settings section. Standard output is a square wave with ~ 50% duty cycle and 0-10v p-p signal. An option available on the unit is a square wave output set to a peak to peak voltage matching the supply line. Some 24volt systems are looking for signals at this level.