Stone Warmer Thermometer This thermometer has a 1 dial with 5 slim stem, a plastic pocket case, shock-proof protection, stainless steel parts, and unbreakable polycarbonate crystal. It has a Safe-T-SetTM external recalibration design with a 1 point calibration for ? 1% at dial midpoint. The temperature range is 0? to 220?F with 2-degree divisions. While this thermometer resembles some in grocery stores, this model is much more accurate.