The Apera PH850-SL (AI5537) is a professional handheld pH meter designed for direct testing of soil, coco coir, and other growing media without preparing a slurry. It includes the Swiss-made LabSen 553 PVC spear electrode, featuring reinforced glass and an open double-junction design to resist breakage and clogging. Readings typically stabilize within 15–30 seconds.
• Brand: Apera Instruments
• Model / SKU: PH850-SL / AI5537
• pH Range / Accuracy: 0–14 pH / ±0.01 pH
• Included Electrode: LabSen 553 PVC 3-in-1 pH/temperature spear electrode
• Compatible Media: Soil, coco coir, and other growing media
• Electrode Features: Reinforced S-type glass membrane (10× stronger than conventional glass), open double junction, polymer electrolyte
• Reading Time: Approximately 15–30 seconds
• Temperature Compensation: Automatic (ATC), −5 to 80°C
• Calibration: Automatic 1–3-point calibration; recognizes five standard pH buffers
• Protection Rating: IP57 waterproof and dustproof
• Additional Features: Electrode-condition diagnostics, slope display, and foldable benchtop stand
• Included Accessories: pH 4.00, 7.00, and 10.01 calibration buffers and rugged carrying case
• Warranty: 3 years for the meter; 6 months for the electrode
Key Advantage: Enables direct root-zone pH testing without slurry preparation. Its reinforced spear electrode and replaceable design make it practical for frequent soil and coco monitoring in commercial cultivation facilities.