It is great for testing real current consumed by electrical gadgets used in our homes. A clamp meter is like a digital multimeter with a jaw which can clamped around a wire of an operating electrical instrument to measure current.
Vent your electric dryer indoors during the winter to save on electricity (no cold outside air entering dryer to replace the vented air), and gas (heat is released into the house). WARNING: Electric dryers in dry climates only! (The steam released into the air is great in Utah, but will foster mold in more humid places.)