I have bought many 613 models (pictured left) over the last 2 years to use around the house and they have always differed within 2% of each other - usually 1 or same . This is the second (and last) time I've purchased this model and both times the moisture readings don't match my other meters. Maybe he's right, and others are always wrong - who knows. But the next one I buy will be 613.
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