Bluelab CAREKITPH pH Probe Care Kit with Calibration Supplies, Storage Solution, and Brush, Used for Pen, Meter, Monitor, Controller and Tools for Hydroponic System and Indoor Plant Grow, Clear sold2026 Taidacent Non Contact Liquid Level auspowers_batchfour Taidacent Non Contact Liquid Level Sensor Contactless Water Tank Water Level Sensor for Tank Water Level Control with Low and High Level Output Compatible With: Samsung Galaxy Smartphones and tablets with Micro USB Port Android Phones like LG it affects the accuracy of the reading displayed A calculation is then done in the instruments brain or micro computer and a reading is then displayed