The AC Infinity Replacement Probe (AC-PPA5) is the genuine replacement sensor for the AC Infinity pH Meter PRO Kit (AC-PHM5). It brings a worn pen back to full performance: a new lithium glass membrane reading pH to ±0.01 plus temperature, a sensor shield over the glass, and a sealed screw-in fit rated IP67. Stocked in Sydney and shipped domestically. ±0.01 pH pH and temperature AC-PHM5 fits the pH Meter PRO only IP67 sealed screw-in fit Genuine genuine AC Infinity, QBL-backed Compatibility: this probe fits the pH Meter PRO Kit (AC-PHM5) only. It does not fit the Hydroponic Meter PRO Kit (AC-PHM7), which uses the AC-PPA7 probe, and the standard pH Meter Kit (AC-PHM3) has a fixed probe that cannot be replaced. Advanced water testing Every pH probe ages. The glass membrane slowly loses response, readings take longer to settle, and calibration stops holding. AC Infinity put the average life of a pH probe at about 18 months. On the pH Meter PRO you replace only this part: the pen body, screen and electronics carry on, which costs less than a new meter. High level precision A fresh lithium glass membrane gives the same ±0.01 pH accuracy the pen had new, with temperature read at the probe. A detachable shield covers the glass against knocks, and the probe seals to the body on installation so water cannot get into the meter. Fitting it Unscrew the old probe from the pen, screw the new one on until it seats and seals, then soak the glass in KCL storage solution before first use and run a full calibration (7.00 first, then 4.00 and 10.01). The calibration instructions walk through each step. Specifications Product identification Manufacturer AC Infinity Inc. Product name pH Meter PRO Replacement Probe Model AC-PPA5 UPC 819137024601 Performance and technical Sensor pH and temperature Probe Interchangeable lithium glass membrane Protection Detachable sensor shield Accuracy ±0.01 pH Ingress rating IP67 Compatible with pH Meter PRO Kit (AC-PHM5) Documentation User manual pH Meter PRO manual (PDF) Calibration Calibration instructions (PDF) FAQ How do I know my probe needs replacing? Readings that creep and never settle, or a calibration that fails or drifts within days, after the probe has been cleaned and soaked in storage solution. If a soak and recalibration fix it, the probe still has life left. Does it fit the standard pH Meter Kit? No. The standard pH Meter Kit (AC-PHM3) has a fixed probe. This part is for the pH Meter PRO only. Do I need to recalibrate after fitting it? Yes, always. Every probe is slightly different, so a new probe on old calibration values will read wrong. Soak it, then calibrate with fresh 7.00, 4.00 and 10.01 solution. How do I make it last? Store it wet with KCL solution in the cap, rinse with clean water between samples, never wipe the glass bulb, and rinse after salty or chlorinated water.
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