Bluelab Guardian Monitor Size:Replacement Probe Optimal spray coverage is achieved

Optimal spray coverage is achieved with precise mister placement

Choose from six different 100-foot sizes

M7 Operator MH+

UL-listed NOTE: Models 40 GPH-160 GPH contain a steel shaft and are not suitable for saltwater applications

Bluelab Guardian Monitor Size:Replacement Probe Optimal spray coverage is achievedAdjustable 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