Description The Seeed Studio Grove ORP Sensor Kit Pro measures oxidation-reduction potential in liquids for water quality monitoring, environmental testing and Arduino/Grove sensing projects. It combines a Grove driver board with an exchangeable BNC ORP probe, so the sensor can connect to Grove-compatible Arduino boards through the included Grove cable. The 5 meter IP68 ORP probe supports a -2000mV to +2000mV range, 1mV resolution and +-15mV accuracy at 0-60°C. It is designed for redox comparison in disinfected water, aquaculture water, wastewater treatment and industrial sewage monitoring scenarios. ORP measurement indicates the activity of oxidizers and reducers in an aqueous solution. Different redox processes produce different ORP values; aerobic conditions usually read higher than anaerobic conditions, and spa water is commonly kept around 650mV to 750mV. Note White solid granular crystals may appear around the probe shroud after shipping. The official product page states this can be caused by temperature change, environmental change or redox during delivery, and it does not affect the internal potassium chloride solution or normal sensor operation. If crystals are present, gently wipe them off with a wet paper towel and keep the residue away from children to avoid accidental ingestion. Features Grove ORP sensor kit with a 5 meter IP68 probe for liquid ORP measurement. -2000mV to +2000mV sensing range with 1mV resolution. +-15mV accuracy at 0-60°C and 0-80°C probe operating temperature. Supports both 3.3V and 5V working voltage for Arduino and Grove projects. Exchangeable BNC-linked probe design for easier probe replacement. RoHS certified design for environmentally conscious sensing applications. Applications Monitoring and controlling oxidation-reduction reactions. Disinfected water and health-friendly water detection. Microbial environment comparison and anaerobic activity detection. Wastewater treatment, aquaculture and industrial sewage discharge monitoring. Specifications Measurement range -2000mV to +2000mV Resolution 1mV Accuracy +-15mV Aero potential point (pH) 7.00+-0.30 Slope factor >96% Work voltage 3.3V / 5V Work temperature 0-80°C Liquid junction boundary Polyvinyl tetrachloride Housing material PPS Membrane resistance
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