The E models combine all the features of our analog models but offer ease of temperature setting and the stability of a full PID microprocessor that accurately maintains settings within +/- 0.5 °C even in varying ambient or power supply conditions. A unique temperature tracking feature stores temperature deviation from set point. This feature helps to confirm stability or indicate any control malfunction or power loss throughout a process period. The control features large LED's that continuously display process temperature and a setting lock mode that protects against inadvertent adjustment.