Abstract: Disclosed herein is a CD power pack tester adapted for connection to an AC line and to a CD power pack, the CD power pack including a rectifier circuit connected to a charge capacitor and an ignition SCR which allows the charge capacitor to discharge through an engine ignition coil to effect firing of an engine spark gap.

Abstract: A voltmeter for selectively indicating the polarity and magnitude of a peak value of voltage. The voltmeter comprises an ammeter, a diode bridge including positive and negative terminals and first and second probe terminals, a capacitor connected to the positive and negative terminals, and variable resistance switching means connected in series between one of the positive and negative terminals and the ammeter for selectively coupling the ammeter across the positive and negative terminals. Filter switching means are provided for selectively coupling the probe terminals to a single polarity of the voltage whereby the voltmeter affords charging of the capacitor so that the magnitude of the positive voltage differential between the positive and negative terminals is substantially equal to the magnitude of the peak value of the single polarity of voltage coupled to the probe terminals.