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Some say that’s one of the reasons the “3 meter/100mW” rule was adopted for the AM band (pre-expanded band of 550 KHz – 1610 KHz)
Certified, around $3,000
Not certified, around $300
And it is said that the certified meter should be operated by an engineer for best results. Bigger cities might have service firms that could be hired for this, otherwise, I don’t know.