What is the big box that stabilizes ammeter and voltmeter readings?

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Does anyone know the name of the big box that you can connect to a circuit, to stop the ammeter and voltmeter readings jumping around?
 
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PenguinBoy said:
Does anyone know the name of the big box that you can connect to a circuit, to stop the ammeter and voltmeter readings jumping around?
Why are the ammeter and voltmeter readings jumping around? If it is because someone is playing with the on/off switch, then you would use a lock box.

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