Measurement accessories including watt meters and other useful measuring and diagnostic electric flight accessories.
When flying with electric power, there is no need to carry lead acid batteries, fuel pumps, electric starters and ignition batteries to the field. One of the most useful and important electric flight accessories for the sport flyer is a watt meter, or power meter, to assist in determining the most efficient propeller for the particular motor and speed controller combination.
Your electric motor will start without it, but you can carry your watt meter to the field with you, if you wish!