The Apera PH850-DP (AI5535) is a professional handheld pH meter designed for testing milk, yogurt, cream, sauces, protein-containing liquids, enzyme solutions, and pharmaceutical samples. It features the Swiss-made LabSen 823 combination pH/temperature electrode, which uses a Silver Ion Trap reference system and Protelyte electrolyte to reduce junction clogging and measurement drift in protein-rich samples. Its IP57-rated body, foldable stand, and automatic temperature compensation support both field and benchtop testing.
• Brand: Apera Instruments
• Model / SKU: PH850-DP / AI5535
• pH Range / Accuracy: 0.00–14.00 pH / ±0.01 pH
• Temperature Range: −5 to 100°C; accuracy ±0.5°C
• Included Electrode: Swiss-made LabSen 823 3-in-1 pH/temperature electrode
• Electrode Features: Silver Ion Trap reference system and protein-inert Protelyte electrolyte
• Glass Membrane: S-type hemispherical membrane, approximately 10× stronger than conventional glass bulbs
• Reading Stabilization: Approximately 15–30 seconds
• Calibration: Automatic 1–3-point calibration; recognizes pH 1.68, 4.00, 7.00, 10.01, and 12.45
• Protection Rating: IP57 waterproof and dustproof
• Additional Features: Foldable stand, silicone grip sleeve, electrode diagnostics, and automatic temperature compensation
• Included Accessories: Calibration buffers (pH 4.00, 7.00, 10.01), Protelyte soaking solution, and carrying case
• Warranty: 3 years for the meter; 6 months for the electrode.
Key Advantage: The PH850-DP uses a specialized protein-resistant electrode to deliver more stable pH readings in dairy, sauces, and other complex liquid samples where standard probes may clog or drift.