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You would need a 4-wire meter to measure the exact sub-ohms of the contacts, but a quick check would be to energize the coil and just measure resistance across the contacts.

If it measured more than 1 Ohm then it might be damaged; if it is good then it will be under 1 ohm in the 0.1 region depending upon your meter.

For diy use it may not be as critical that it be in "perfectly new" condition. i never send anything back if they offer a discount to make it right, but that's just me.
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