Overview Reviews Product Description This digital pH pen displays both temperature and pH simultaneously on a dual LCD display. The R3500 features automatic temperature compensation for accurate readings and includes a built-in calibration procedure. Dual LCD displays temperature and pH measurements User selectable °F or °C Automatic temperature compensation Replaceable pH electrode module Data hold function Waterproof housing Protective cap keeps sensor moistened Low battery indicator and auto shut off Reed Instruments Catalog R3500 Datasheet Product Videos Custom Field Product Reviews Write a Review Write a Review × Reed Instruments pH Meter & Buffer Solution Kit R3500-KIT Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *