Well there you go, I stand corrected.
I also got into the habit of swapping out the carrot for a different one at least once per cycle, but I found the tensiometer needed re-filling at least twice per round. If you are inclined to buy one, DO NOT forget to cover the top of the tensiometer with something because they are NOT water proof... not even water resistant. I always used a clear plastic "shortie" solo cup to cover it... I think you can buy covers for them now that are made specifically for this purpose. I also found a thin walled pipe a little smaller in diameter than the carrot, so I pre-punch a hole for the carrot through the root zone, so that I'm not applying too much pressure on the carrot or tensiometer when re-installing.