What does the O in the designation stand for? I have the supply but no manual. The M stands for Meter, which it is equipped with. Is the O for overcurrent protection? overvoltage? TIA de ben k8dit. -- FAQ on WWW: http://www.contesting.com/FAQ/tentec Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com