Multimeter
A handy VOM (Multimeter) for testing and electronics work

Straight fueling is using Hydrogen solely as a fuel.
Dual fueling is using Hydrogen in any device that can also use another fuel solely - but neither is used at the same time. An example might be a small engine, or a natural gas or propane fueled home appliance like a furnace, hot water heater or clothes dryer
It ain't rocket science but there is more to it than you think
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