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With EZ-CAL® Calibration the fob is used over a specific “CAL” area of the sensor’s enclosure cover. When calibration conditions change from their optimum setting, the external green calibration light will blink to notify the operator of a less than perfect calibration condition and to recalibrate the unit. Calibration can be accomplished in less than 30 seconds, without moving the material in and out of the vessel, eliminating the tedious task of calibration typical of competitive level controls.