Purchased this item because of a recommendation in Cook's Illustrated magazine, and quickly discovered that our relatively new Trivection oven was apparently off by 30F!NOT!!! We've got two other thermometers (not intended as oven thermometers, but pressed into service) and the oven's thermostat that agree with each other closely. This thermometer is theoretically adjustable (i.e. the tube can be moved in its brackets) and apparently did so on its own.This thermometer is inexpensive (not cheap) but with Taylor's name on it, and Amazon selling it diredtly, one would expect it to be dead on out of the box. Why I was forced to calibrate a brand-new thermometer in boiling water is beyond comprehension.