Ours usually gets to 150° and we measure with a compost thermometer. We also have some deep fryer thermometers (from WalMart in the BBQ section) which were inexpensive and work fairly well. They don't reach in as far as the compost thermometer, but probably a good bit further than your meat thermometer. We have lots of horse, chicken, sheep, etc., manure in our piles, so it heats pretty well.
Sherry
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