The Apera PH850-MS (AI5539) is a professional handheld pH meter designed for accurate testing of small-volume liquid samples. It includes the Swiss-made LabSen® 243-6 semi-micro pH/temperature electrode, featuring a slim 6 mm diameter tip that measures samples as small as 200 µL normally and 60 µL with the included micro-container. Its integrated temperature sensor provides automatic temperature compensation, while the IP57-rated body and foldable stand support both field and benchtop use.
• Brand: Apera Instruments
• Model / SKU: PH850-MS / AI5539
• pH Range / Accuracy: 0–14.00 pH / ±0.01 pH
• Minimum Sample Volume: 200 µL normally; 60 µL with included micro-container
• Included Electrode: Swiss LabSen® 243-6 semi-micro pH/temperature electrode
• Electrode Dimensions: 100 mm length × 6 mm diameter
• Temperature Range: 0–100°C with automatic temperature compensation
• Calibration: Automatic 1–3-point calibration; recognizes five standard buffers
• Protection Rating: IP57 waterproof and dustproof
• Additional Features: Refillable electrode, blue gel electrolyte, foldable stand, and electrode-condition diagnostics
• Power Supply: 2 × AA batteries
• ORP Capability: Supported with separately purchased 301Pt-C electrode
Key Advantage: The PH850-MS enables accurate pH testing with extremely small sample volumes, making it particularly useful for tissue culture, propagation laboratories, and small-batch nutrient testing. Its replaceable BNC-connected electrode also allows the meter to accommodate other compatible Apera specialty probes.