The Ametek Jofra RTC700 Reference Temperature Calibrator is the most accurate and stable reference temperature calibrator on the market. It features a wide temperature range of -100°C to 660°C, and its stability is ±0.005°C. The RTC700 also has a built-in reference thermometer, which eliminates the need for an external reference. This makes it the ideal choice for calibrating temperature sensors and other temperature-measuring devices.