SX725 Portable pH/Dissolved Oxygen (DO) Meter
Apera Instruments SX725 Portable pH/Dissolved Oxygen (DO) Meter, measuring (0 to 19.99) mg/L (ppm). Runs on 2 AA batteries (1.5V ×2).
| Measuring Range | (0 to 19.99) mg/L (ppm); (0 to 200.0) %.; (-2.00 to 19.99) pH |
|---|---|
| Resolution | 0.1/0.01 mg/L (ppm); 1/0.1 %; 0.1/0.01 pH |
| Accuracy | ±0.30 mg/L (ppm), incl. Electrode error; Instrument: ±0.01 pH; Total: ±0.02 pH |
| Response Time | ≤ 30s (90% response at 25°C) |
| Air Pressure Compensation | (66 to 200) kPa (manual) |
| Automatic Calibration | Air saturated with water; water saturated with air |
| Data Storage | 300 data sets |
| Dimensions & Weight | Meter: (65×120×31) mm/180 g Complete set: (255×210×50) mm/1380 g |
| Electrode Type | Polarographic |
| Input Current | ≤2×10-12 A |
| Input Impedance | ≥1×1012Ω |
| IP Rating | IP57 |
| Memory Values | Serial number, measured value, measuring unit and temperature |
| Quality and safety certification | CE, ISO 9001:2015 |
| Salinity compensation range | (0 to 45) ppt (automatic) |
| Stability | ±0.01 pH/3h |
| Temperature Compensation | (0 to 100) °C (automatic); (0 to 45) °C (automatic) |
| Power Supply | 2 AA batteries (1.5V x2) |
| Manufacturer | Apera Instruments |
| MPN | AI465 |
| Item number | AI465 |
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
Product documents
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