Apera SX731 7-in-1 Portable Multi-Parameter Water Quality Meter Kit
The Apera SX731 delivers lab-grade measurement of 7 water quality parameters in a single field-ready kit: pH, ORP (redox), conductivity (EC), TDS, salinity, resistivity, and temperature. With automatic electrode recognition, digital filter technology, and 400-set data logging, it’s the most capable portable multi-parameter meter for water treatment, environmental monitoring, hydroponics, aquaculture, and field research.
Core Instrument Features
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7-in-1 Measurement — pH, ORP, EC, TDS, salinity, resistivity, and temperature from one meter with three dedicated electrodes
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Automatic Electrode Recognition — Connect any electrode and the meter auto-switches to the correct parameter mode — no manual mode selection
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Digital Filter Technology — Enhances response time and measurement accuracy in noisy or variable field conditions
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400-Set Data Logging — Store and recall up to 400 measurement sets for field documentation and compliance reporting
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IP57 Waterproof & Dustproof — Rugged structure built for harsh field and environmental monitoring environments
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Auto Calibration, ATC, Self-Diagnosis, Auto Power-Off — Full suite of intelligent functions for reliable unattended operation
pH Measurement (201T-S Electrode)
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Lithium Glass Membrane + Fiber Ceramic Junction — Fast response and accurate pH readings across the full range
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1–3 Point Auto Calibration — Recognizes up to 13 pH buffer standards
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LabSen Electrode Compatible — With the 8-pin to BNC converter (sold separately), connect any LabSen pH electrode for specialized applications (food, soil, protein samples)
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Self-Diagnosis — Identifies common electrode problems and guides corrective action
Conductivity / EC / TDS / Salinity / Resistivity (2301T-S Electrode)
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Platinum Black Sensor — Apera’s proprietary BPB electrode; ±1% F.S. accuracy across 0–200,000 µS/cm wide range
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Easy Parameter Switching — Toggle between EC, TDS, salinity, and resistivity from a single electrode
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1-Point Auto Calibration — Recognizes up to 8 conductivity standards
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ATC 0–50°C — Automatic temperature compensation; non-linear ATC activates below 10 µS/cm for significantly improved pure water accuracy
ORP / Redox Measurement (301Pt-S Electrode)
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Platinum ORP Electrode — Stable potential and fast response; no ORP calibration required
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Easy Maintenance — Platinum sensor is simple to clean and maintain in the field
Technical Specifications — pH
| Parameter |
Specification |
| pH Range |
-2.00 – 19.99 pH |
| pH Resolution |
0.01 / 0.1 pH |
| pH Accuracy |
±0.01 pH ± 1 digit |
| Input Current |
≤ 2×10⁻¹² A |
| Input Impedance |
≥ 1×10¹² Ω |
| ATC Range |
0–100°C (Automatic) |
| Data Logging |
400 sets |
| Waterproof Rating |
IP57 |
| Power |
Rechargeable battery (check kit) |
| Weight |
2 lbs (with case) |
Applications
Water treatment, groundwater monitoring, surface water testing, environmental monitoring, hydroponics, aquaculture, aquarium management, beverage production, field research, and laboratory use.
What's in the Kit
- SX731 Multi-Parameter Meter
- 201T-S pH/Temperature Electrode
- 2301T-S Conductivity/Temperature Electrode
- 301Pt-S Platinum ORP Electrode
- pH Calibration Solutions
- Conductivity Calibration Solution
- Rugged Carrying Case
- User Manual
