Your eyes,nose,ears & hands are a better moisture meter than you could buy.
Does it look wet? Is it darker on end grain or other exposed surfaces? Is there lots of cracks on end grain?
How does it smell?
Does it feel 'cold & wet' in your hands?
Sound - does 2 pieces hit together make a dull thud or a sharp sound like the crack of a baseball hitting a bat?
Well stated Thistle!
Only one point is the cracks on the end grain. For sure they should be there but too many see that and immediately think the whole log is dry. Not so!