Since the zapper emits a square wave that is usually half ON and half OFF, a volt meter will indicate only about half the peak voltage. To check the peak voltage, take an oscilloscope and see what the peak voltage is. It should be at least 9 V.
Since the zapper emits a square wave that is usually half ON and half OFF, a volt meter will indicate only about half the peak voltage. To check the peak voltage, take an oscilloscope and see what the peak voltage is. It should be at least 9 V.