METER ProCheck Handheld Multifunction Data Logger & Meter

Overview

The METER ProCheck Handheld Multifunction Data Logger & Meter is a field-deployable, single-channel digital interface engineered for rapid verification, calibration validation, and real-time data acquisition from METER’s broad portfolio of environmental sensors. Operating on the SDI-12 communication protocol and supporting analog voltage (mV) inputs, the ProCheck functions as both a portable readout device and a lightweight data logger—designed specifically for soil moisture, soil water potential, meteorological, and aquatic sensor systems used in agronomy, hydrology, ecology, and environmental monitoring applications. Its core architecture implements deterministic serial communication with precise timestamping (date + time), ensuring traceable, auditable field measurements aligned with GLP-compliant workflows. Unlike generic multimeters, the ProCheck embeds sensor-specific firmware logic—including built-in calibration coefficient tables for media-specific dielectric permittivity corrections—enabling immediate translation of raw sensor output (e.g., frequency, voltage, or resistance) into physically meaningful units (e.g., volumetric water content θ_v, electrical conductivity σ, matric potential ψ_m, temperature T).

Key Features

• Single-channel SDI-12 and analog (mV) sensor interface with automatic protocol detection
• On-device calculation of statistical metrics: real-time mean and standard deviation across sequential readings
• Embedded factory calibration libraries for >30 METER sensor models—including soil, non-soil, and aquatic media—plus user-definable calibration coefficients
• 5,000-readings internal storage (1 MB flash memory), each record containing sensor ID, timestamp, raw value, calibrated value, and applied calibration parameters
• NEMA 1 / IP20 splash-resistant enclosure (15.5 × 9.5 × 3.3 cm; 4× AA batteries; ~40 h typical runtime)
• RS-232 serial output via 3.5 mm stereo jack; compatible with Windows-based ProCheck Utility software for configuration and Excel (.xlsx) export
• No external programming required for SDI-12 address assignment—supports plug-and-play setup for 5TE, 5TM, GS3, TEROS 21, HYDROS 21, and other legacy and current-generation METER sensors

Sample Compatibility & Compliance

The ProCheck interfaces exclusively with METER-manufactured sensors conforming to SDI-12 v1.3 or analog voltage output specifications. Verified compatibility includes soil moisture sensors (EC-5, 5TE, GS3, TEROS 21), soil water potential sensors (TEROS 21, MPS-1/2, UMS T8 series), meteorological sensors (ATMOS-41, ECRN-50/100, VP-4, PYR), and specialty probes (HYDROS 21, PHYTOS 31, Apogee SI-4xx IR thermometers). All firmware and calibration routines comply with ASTM D5763 (soil water content by capacitance), ISO 11277 (soil physical analysis), and USDA NRCS Soil Moisture Monitoring Guidelines. The device carries CE marking per Directive 2014/30/EU (EMC) and 2011/65/EU (RoHS), confirming electromagnetic compatibility and restricted substance compliance for laboratory and field use in EU-regulated environments.

Software & Data Management

The ProCheck Utility desktop application (Windows only) provides bidirectional communication for device configuration, firmware updates, and bulk data retrieval. Exported datasets include structured metadata headers—sensor type, model number, serial ID, measurement units, calibration source (factory/user), and audit trail timestamps—formatted natively in Microsoft Excel (.xlsx) for direct integration into QA/QC pipelines, LIMS systems, or statistical analysis platforms (e.g., R, Python pandas, JMP). Data files retain full traceability: each row corresponds to one physical reading, with no interpolation or averaging applied during export. The utility supports batch processing of multiple ProCheck units and generates CSV-compatible logs for long-term archival under 21 CFR Part 11–aligned environments when paired with validated IT infrastructure.

Applications

• Pre-deployment sensor validation: verifying signal integrity, contact quality, and zero-offset before permanent installation in lysimeters, flux towers, or irrigation networks
• Field troubleshooting: diagnosing air gaps, rock interference, or poor probe-soil coupling via immediate θ_v/σ/ψ_m response anomalies
• Calibration verification audits: comparing field-collected values against reference standards or lab-measured samples
• Educational field labs: teaching principles of sensor physics, calibration transfer, and uncertainty propagation in environmental measurement science
• Regulatory monitoring support: generating auditable records for EPA Method 9045C (soil moisture), ISO 11274 (water retention), or FAO Irrigation and Drainage Paper No. 56 (evapotranspiration modeling inputs)

FAQ

Does the ProCheck support multi-sensor daisy-chaining over SDI-12?
Yes—it assigns unique SDI-12 addresses to up to 62 sensors on a single bus, with automatic address conflict detection and manual override capability.
Can calibration coefficients be edited directly on the device?
Yes—users may input custom slope/offset or polynomial coefficients via the on-screen menu without requiring PC connectivity.
Is the ProCheck compatible with third-party SDI-12 sensors?
It communicates only with METER-branded SDI-12 sensors due to proprietary command extensions and calibration mapping structures.
What is the temperature operating range for reliable battery performance?
The unit operates continuously between –5 °C and 50 °C; alkaline AA batteries are rated for stable output down to –10 °C, though low-temperature capacity reduction applies.
How is data integrity ensured during power loss or unexpected shutdown?
All readings are written to non-volatile flash memory immediately upon acquisition; no volatile RAM buffering is used, eliminating risk of data loss during battery replacement or interruption.