Bimetal Temperature Gauge Back Connection “True Teller” is the most reliable and accurate temperature sensor requiring no electricity or wiring. In a wide range of process applications, the Back Connection Temperature is well-suited for obtaining accurate temperature readings at a local level, specifically at eye level. The recalibration process involves adjusting the calibration screw located on the rear side of the dial. A wide range of options are available to cater to your specific process requirements.