The Apera Instruments SX725 is a professional-grade portable meter for accurate pH and dissolved oxygen (DO) measurements in a wide range of water quality applications. Built with field use in mind, it features IP57-rated water and dust resistance, a rugged handheld design, and comes in a durable carrying case for use even in harsh outdoor conditions.

This device includes the 201T-S pH/temperature electrode, known for its fast response and stability, and the DO500 polarographic electrode, which is ready to measure in just 5 minutes. With automatic temperature and salinity compensation and manual barometric pressure adjustment, the SX725 ensures precise DO readings. The digital filtering technology enhances both response speed and measurement accuracy. It supports 1 to 3-point pH calibration, and stores up to 300 data sets for easy review.

Perfect for water treatment, environmental monitoring, aquaculture, beverage production, aquarium care, and surface/groundwater testing, the SX725 delivers lab-level performance in the field.

Key Features:

✔ High-precision pH and DO measurement with temperature
✔ DO500 polarographic electrode with fast 5-minute polarization
✔ 90% DO response within 30 seconds
✔ Automatic temp. & salinity compensation, plus manual pressure adjustment for DO
✔ 201T-S pH electrode with lithium glass membrane and ceramic diaphragm
✔ Quick and easy pH calibration (1–3 points)
✔ Digital filtering improves response and accuracy
✔ Memory storage for up to 300 data sets
✔ IP57-rated water/dust resistance – built for rugged field use
✔ 3-year meter warranty (6 months for electrodes)
✔ Supplied as a complete ready-to-use kit

Complete Kit Includes:

• SX725 pH/DO meter

• 201T-S pH/temp. electrode

• DO500 polarographic DO electrode

• pH calibration solutions (4.00, 7.00, 10.01 – 50 ml each)

• DO502 electrolyte refill solution

• 3x DO503 replacement membrane caps

• Polishing paper for electrode maintenance

• User manual

• 2x AA batteries

• Screwdriver

• Sturdy carrying case