Adjustable brightness display. Large easy-to-read, plant-safe green LED displays. Selectable values for conductivity and temperature. Simple push-button pH calibration system. No calibration required for conductivity and temperature. Silent alarm for both high and low settings. Settings retained when power lost (non-volatile memory). Temperature compensation. An international power supply. Water-resistant design. 2-year Bluelab® Guarantee (6 months on probe).