Product review (3 stars): As long as you don't mind the readings being off by up to 15 degrees...
My only complaint is that for the SEVEN different sensors I bought for this base unit, none seem to be of very consistent/accurate ability. I calibrate all of them to the same temp, and as soon as I save the settings, the values are different for many of them.  Repeat, and it may take a couple of hours for them to differ, even if they are all in the same cardboard box, lined up side by side.  NOT very accurate.  In a 66 degree temp environment, 1 insists it is over 100 degrees, routinely.