YSI 9800 Photometer Kit disposable and typically runs 10+ years

and typically runs 10+ years on its internal battery

single-installation piezometer rather than one designed to be retrieved

40 pH/ORP Sensor with Module 626904 $666

Motor Thrust Washer Kit

YSI 9800 Photometer Kit disposable and typically runs 10+ yearsPortable, multiparameter photometer for water quality testing in the field and laboratory. Directly measures over 30 water quality parameters using proven photometric (colorimetric) test methods, with a large color touchscreen and onscreen step by step instructions. Waterproof (IP 67), impact tested, and usable with wet or gloved hands. Kit includes: 9800 photometer, carrying case, dilution tube, 10 mL luer slip syringe, polishing cloth, absorbent