HACH Pocket Pro and Pocket Pro+ Portable Water Quality Test Pens

Overview

The HACH Pocket Pro and Pocket Pro+ are handheld, single- or multi-parameter electrochemical test pens engineered for rapid, on-site water quality assessment in resource-constrained or mobile environments. Based on potentiometric (pH, ORP) and conductometric (conductivity, TDS, salinity) measurement principles, these instruments deliver traceable, field-ready data without requiring benchtop infrastructure. Each pen integrates a sealed, factory-calibrated sensor cartridge with temperature compensation (NTC thermistor) to ensure accuracy across variable ambient conditions. The Pocket Pro+ extends functionality with user-replaceable sensor modules, enabling modular maintenance and long-term instrument lifecycle management—critical for laboratories, utilities, and field service teams operating under ISO/IEC 17025-aligned quality systems.

Key Features

• Multi-parameter capability: Simultaneous or dedicated measurement of pH (0.00–14.00, ±0.02), ORP (±1999 mV, ±1 mV), conductivity (0–200 mS/cm, auto-ranging), TDS (0–100,000 ppm), salinity (0–100 ppt), and temperature (0–50 °C, ±0.3 °C).
• Modular sensor architecture: Pocket Pro+ supports interchangeable sensor cartridges—each pre-calibrated and serialized—reducing downtime and eliminating the need for full-unit replacement.
• On-device diagnostics: Built-in self-test verifies electrode response slope, offset, and junction integrity prior to calibration; alerts users to drift or contamination before measurement errors occur.
• GLP-compliant operation: Supports manual calibration logging (date/time-stamped), pass/fail calibration verification, and stable reading lock—enabling traceability required for internal QA audits and regulatory review.
• Ergonomic field design: IP67-rated housing resists dust and immersion up to 1 m for 30 min; rubberized grip and one-handed operation facilitate use in wet, outdoor, or confined spaces.

Sample Compatibility & Compliance

These pens are validated for direct immersion in aqueous matrices including potable water, cooling tower fluids, wastewater effluents, swimming pool and spa recirculation lines, aquaculture tanks, and beverage process streams. They meet ASTM D1293 (pH of water), ASTM D5391 (conductivity of pure water), and ISO 7888 (electrical conductivity) methodology prerequisites when used per manufacturer-specified protocols. While not standalone 21 CFR Part 11-compliant devices, their calibration logs and diagnostic outputs support integration into Part 11–governed data workflows when paired with validated electronic lab notebooks (ELNs) or LIMS platforms.

Software & Data Management

The Pocket Pro and Pocket Pro+ operate independently of PC software—data is displayed and retained locally on the device. No proprietary drivers or cloud connectivity are required, minimizing cybersecurity exposure and ensuring operational continuity in low-connectivity field settings. Calibration history, last-measured values, and sensor status remain stored in non-volatile memory for ≥1,000 cycles. For centralized reporting, users may manually transcribe readings or integrate via third-party barcode scanning tools linked to validated spreadsheets or LIMS templates compliant with ISO 17025 Clause 7.7 (result reporting).

Applications

• Beverage manufacturing: Monitoring rinse water pH and conductivity during CIP validation and post-sanitation verification.
• Power generation: Tracking condensate purity and demineralizer effluent conductivity in thermal cycle chemistry control.
• Municipal wastewater: Rapid screening of influent/effluent ORP and salinity shifts indicating nitrification/denitrification imbalances.
• Aquaculture and hydroponics: Daily spot-checking of pond or reservoir pH stability and ionic strength to prevent osmotic stress in sensitive species.
• Facility maintenance: Verifying pool/spa sanitizer efficacy via ORP correlation with free chlorine levels per CDC/WHO guidelines.

FAQ

Can the Pocket Pro+ be calibrated with NIST-traceable standards?
Yes—calibration is performed using certified buffer solutions (e.g., pH 4.01, 7.00, 10.01) and conductivity standards (e.g., KCl 0.01 M, 0.1 M) traceable to NIST SRMs.
Is sensor replacement possible without sending the unit to service?
Yes—Pocket Pro+ uses snap-in, pre-calibrated sensor cartridges; replacement requires no tools or firmware reset.
Does the instrument store calibration data across battery changes?
Yes—calibration coefficients and timestamps are retained in EEPROM memory independent of battery power state.
What is the recommended recalibration frequency for routine monitoring?
Per HACH Technical Bulletin TB-117, daily verification with a single-point check is advised; full multi-point calibration every 24–72 hours depending on matrix fouling risk and regulatory requirements.
Are there limitations for high-suspended-solids or viscous samples?
Direct immersion is not recommended for slurries >50 mg/L TSS or fluids with viscosity >10 cP; use flow-through cells or sample dilution per Method 2510B (EPA).