The Apera SX723 (AI477) is a professional handheld water-quality meter designed for commercial cultivation, hydroponics, fertigation, and water-treatment applications. It measures pH, millivolts (mV), electrical conductivity (EC), total dissolved solids (TDS), salinity, resistivity, and temperature using interchangeable pH and conductivity electrodes. Its automatic electrode recognition detects the connected probe and switches to the appropriate measurement mode, simplifying routine testing across multiple reservoirs, irrigation zones, and water sources.
The kit includes a 201T-S pH/temperature electrode and a 2301T-S platinum-black conductivity/temperature electrode. The conductivity probe covers an exceptionally broad range, from 0.5 µS/cm to 200 mS/cm, allowing users to test both low-conductivity source water and concentrated nutrient solutions without changing probes. The IP57-rated meter stores up to 400 measurement records with timestamps, while digital filtering and electrode self-diagnostics support reliable readings during field use. (Hydro Supply Co.)
• Product Type: Handheld multiparameter water-quality meter kit
• Brand: Apera Instruments
• Model: SX723
• SKU: AI477
• Measurement Parameters: pH, mV, EC, TDS, salinity, resistivity, and temperature
• pH Measurement Range: −2.00 to 19.99 pH
• pH Resolution: 0.01 pH
• pH Accuracy: ±0.01 pH (meter/electrometer accuracy)
• Conductivity Range: 0.00 µS/cm to 199.9 mS/cm (approximately 0–200,000 µS/cm)
• Conductivity Accuracy: ±1.0% of full scale (FS)
• TDS Range: 0–100 g/L
• Salinity Range: 0–100 ppt
• Resistivity Range: 0–100 MΩ·cm
• Included pH Electrode: Apera 201T-S combination pH/temperature electrode
• pH Electrode Design: Lithium-glass membrane with fiber-ceramic junction
• Included Conductivity Electrode: Apera 2301T-S conductivity/temperature electrode
• Conductivity Sensor: Platinum-black sensor with K = 1.0 cell constant
• Conductivity Operating Range: Approximately 0.5 µS/cm to 200 mS/cm with the included probe
• Electrode Recognition: Automatic detection and measurement-mode switching when the connected electrode changes
• pH Calibration: Automatic 1–3-point calibration with recognition of up to 13 standard buffer types
• Conductivity Calibration: Automatic one-point calibration with recognition of up to eight standard conductivity solutions
• Temperature Compensation: Automatic temperature compensation for conductivity measurements, 0–50°C
• Digital Filtering: Helps stabilize readings and reduce measurement noise
• Electrode Diagnostics: Self-diagnosis to help identify electrode-condition problems
• Data Storage: Up to 400 measurement groups
• Stored Information: Measurement value, unit, temperature, and timestamp
• Data Recall: Stored readings can be reviewed directly on the meter
• Waterproof Rating: IP57 — dust-tight and protected against temporary immersion up to 1 metre for 30 minutes
• Meter Dimensions: 65 × 120 × 31 mm
• Meter Weight: Approximately 180 g
• Power Supply: Two AA batteries
• Included Calibration Solutions: pH 4.00, 7.00, and 10.01 buffers (50 mL each), plus 1,413 µS/cm conductivity standard (50 mL)
• Other Included Accessories: Both electrodes, two AA batteries, screwdriver, and rugged carrying case
• Primary Applications: Source-water testing, nutrient-solution verification, reservoir monitoring, runoff analysis, and water-treatment checks
• Suitable Growing Systems: Hydroponics, coco coir, and other commercial fertigation systems
• Meter Warranty: 3 years
• Probe Warranty: 6 months
Key Advantage: The Apera SX723 combines pH and conductivity testing with TDS, salinity, resistivity, and temperature measurement in one portable instrument. Its broad conductivity range allows the same probe to test both low-conductivity source water and concentrated nutrient solutions. Automatic electrode recognition, IP57 protection, and 400-record data storage make it especially useful for commercial cultivation teams conducting frequent checks across multiple reservoirs and irrigation zones.