The markings on the housing of the 120 / 240 v ac Protek P-3502C don't say anything about power consumption, only to use a 1 amp fuse. The web page claims the newer models at least are low power or energy efficient so I hooked it up to an $8.00, 60 watt inverter on a 12 v 22 amp hr lead acid gel cell.
It only drew 1.5 amps from the battery but the trace looked blurry and couldn't be adjusted. I hooked up another gel cell in parallel but the current and trace didn't change a bit. I then plugged it back into 120 ac and the trace was back in focus.
Do oscilloscopes require a special sine wave inverter?