a) 0 to 3 or 5 volts D.C. b) 0 to 15 or 30 volts D.C. OHMMETER: Portable instrument powered by battery, not a comparison instrument of the « Weaston Bridge» or magneto type. This ohmmeter should comprise : a) A scale from 0 to 1 MQ (1000000 ohms) minimum which will OF NECESSITY be used for checking all circuits including a contact, open or closed, i.e. to check : - The throttle-spindle switch - The distributor triggering contacts