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

• 7-in-1 Measurement — pH, ORP, EC, TDS, salinity, resistivity, and temperature from one meter with three dedicated electrodes
• Automatic Electrode Recognition — Connect any electrode and the meter auto-switches to the correct parameter mode — no manual mode selection
• Digital Filter Technology — Enhances response time and measurement accuracy in noisy or variable field conditions
• 400-Set Data Logging — Store and recall up to 400 measurement sets for field documentation and compliance reporting
• IP57 Waterproof & Dustproof — Rugged structure built for harsh field and environmental monitoring environments
• Auto Calibration, ATC, Self-Diagnosis, Auto Power-Off — Full suite of intelligent functions for reliable unattended operation

pH Measurement (201T-S Electrode)

• Lithium Glass Membrane + Fiber Ceramic Junction — Fast response and accurate pH readings across the full range
• 1–3 Point Auto Calibration — Recognizes up to 13 pH buffer standards
• LabSen Electrode Compatible — With the 8-pin to BNC converter (sold separately), connect any LabSen pH electrode for specialized applications (food, soil, protein samples)
• Self-Diagnosis — Identifies common electrode problems and guides corrective action

Conductivity / EC / TDS / Salinity / Resistivity (2301T-S Electrode)

• Platinum Black Sensor — Apera’s proprietary BPB electrode; ±1% F.S. accuracy across 0–200,000 µS/cm wide range
• Easy Parameter Switching — Toggle between EC, TDS, salinity, and resistivity from a single electrode
• 1-Point Auto Calibration — Recognizes up to 8 conductivity standards
• 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)

• Platinum ORP Electrode — Stable potential and fast response; no ORP calibration required
• Easy Maintenance — Platinum sensor is simple to clean and maintain in the field

Technical Specifications — pH

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