The SX716 from Apera Instruments is designed for laboratory-grade dissolved oxygen (DO) measurements and is suitable for all general water solutions. Its compact design, dust and water resistance (IP57), and the included rugged carrying case make the SX716 ideal for field use, even in harsh environments. The integrated memory function allows for the storage and recall of 100 data sets. Possible applications include water treatment, environmental monitoring, beverage production, aquaculture, groundwater monitoring, surface water, and aquarium monitoring, among others. The DO500 polarographic electrode is polarized and ready to measure in just 5 minutes. Its functionality, automatic temperature and salinity compensation, and manual barometric pressure compensation enable fast and precise DO measurements. Equipped with Apera Instruments' fast-response DO500 polarographic electrode with integrated temperature and salinity sensors. Replaceable DO membrane cap (3 replacement membrane caps and a suitable refill solution are included in the kit). Electrode polarization takes only 5 minutes. The measurement achieves a response of 90% within 30 seconds. Automatic compensation for temperature and salinity, manual compensation for barometric pressure. Special digital filter technology further improves response time and measurement accuracy. The integrated memory function allows the storage and recall of 100 data sets. Dust and water resistant to IP57, ideal for use in harsh environments. Supplied as a complete test kit in a robust carrying case. Technical specifications: Oxygen content (DO) measuring range (0 to 19.99) mg/L (ppm); (0 to 200.0)% resolution 0.1/0.01 mg/L (ppm); 1/0.1% accuracy ±0.30 mg/L (ppm), including electrode error. Response time = 30s (90% response at 25°C). Temperature compensation (0 to 45) °C (automatic). Salinity compensation (0 to 45) ppt (automatic). Barometric pressure compensation < (66 to 200) kPa (manual). Automatic calibration. Air saturated with water; water saturated with air. Electrode type: Polarographic. Other features: Memory capacity: 100 data groups. Memory values: serial number, measured value, unit of measurement, and temperature. Power supply: 2 AA batteries (1.5V x2). Dimensions and weight: Meter: (65×120×31) mm / 180 g. Carrying case: (255×210×50) mm / 790 g. Quality and safety certification: CE, ISO 9001:2015. IP protection rating. A complete kit includes: SX716 DO meter, DO500 polarographic DO electrode, DO502 electrolyte refill solution, 3x DO503 membrane caps, polishing paper for cleaning the electrode, instruction manual, 2x AA batteries, screwdriver, carrying case. The Apera Instruments SX716 comes with a 3-year manufacturer's warranty (6 months for the electrode).