METTLER TOLEDO One Click™ XPR Series Precision Balances

Overview

The METTLER TOLEDO One Click™ XPR Series Precision Balances represent a purpose-built, workflow-integrated solution for standardized solution preparation in regulated laboratory environments. Engineered for precision gravimetric analysis, these balances operate on the fundamental principle of electromagnetic force compensation (EMFC), delivering high-resolution mass measurement with exceptional repeatability and long-term stability. The One Click™ functionality is not an add-on module but a deeply embedded software-hardware architecture—co-developed with LabX® software—that transforms the balance from a passive weighing device into an active, step-guided SOP execution platform. This system is specifically designed to eliminate manual transcription errors, reduce human variability, and enforce procedural consistency during critical standard solution preparation—a foundational activity in pharmaceutical QC, food safety testing, and fine chemical R&D where traceability and regulatory compliance are non-negotiable.

Key Features

• One Click™ guided workflow: Touchscreen-initiated, step-by-step SOP execution with real-time visual prompts and contextual instructions displayed directly on the balance’s high-resolution color interface.
• SmartTrac™ dynamic dosing visualization: Graphical progress bar and target-mass indicator enable precise, operator-independent sample addition—particularly effective when dosing into volumetric flasks via ErgoClip™ adapters.
• Integrated gravimetric concentration calculation: Automatic computation of final solution concentration (e.g., mg/mL, mol/L) based on measured mass, nominal volume, purity factor, and diluent density—fully traceable and auditable.
• ErgoClip™ capacity flask adapter system: Enables direct, loss-free transfer of solid reference standards into Class A volumetric flasks mounted on the balance pan—eliminating intermediate weighing vessels and associated handling errors.
• Automated documentation: Generation of tamper-evident labels containing full preparation metadata—including analyst ID, timestamp, balance ID, batch number, expiry date, and calculated concentration—with optional barcode/QR code encoding.
• LabX®-driven data integrity: All weighing events, calculations, user actions, and system states are captured with time-stamped, immutable audit trails; supports 21 CFR Part 11 compliance when deployed with LabX® server configuration and electronic signatures.

Sample Compatibility & Compliance

The XPR Series accommodates a broad range of sample formats—from sub-milligram certified reference materials (CRMs) to multi-gram secondary standards—across analytical, semi-micro, micro, and ultra-micro weighing ranges (0.1 µg to 10 kg, depending on model). All models meet or exceed requirements specified in USP (Balance Performance Verification), USP (Weighing on an Analytical Balance), and ISO/IEC 17025:2017 (clause 6.4.3 on equipment suitability). The One Click™ workflow enforces adherence to Good Manufacturing Practice (GMP) and Good Laboratory Practice (GLP) principles by mandating user authentication, prohibiting unlogged deviations, and ensuring all inputs are digitally recorded without manual intervention.

Software & Data Management

LabX® software serves as the central orchestration layer for the One Click™ ecosystem. It enables method creation, version control, role-based access management, and centralized reporting across multiple XPR instruments. Raw data—including intermediate mass values, calculated concentrations, environmental parameters (temperature, humidity), and digital signatures—is stored in a relational database with full revision history. Export options include PDF reports (with embedded digital signatures), CSV datasets for LIMS integration, and XML files compatible with enterprise quality management systems (QMS). Electronic record retention complies with FDA 21 CFR Part 11 and EU Annex 11 requirements when configured with appropriate validation protocols and system administration controls.

Applications

• Pharmaceutical QC labs preparing USP/EP reference standards for HPLC, GC, and titrimetric assays.
• Food and beverage laboratories quantifying allergen reference materials or nutritional fortificants.
• Contract research organizations (CROs) executing GLP-compliant method validation studies requiring full traceability of standard preparation.
• Academic and industrial R&D groups developing novel analytical methods where reproducibility of stock solutions directly impacts calibration curve fidelity.
• Environmental testing labs preparing certified calibration standards for ICP-MS and AAS instrumentation.

FAQ

Does One Click™ require LabX software to function?
Yes—the One Click™ workflow is fully dependent on LabX® software for method definition, execution logic, and data archiving. Standalone balance operation supports basic weighing only.
Can I customize the SOP steps and fields in the One Click™ interface?
Yes—LabX® allows full customization of prompts, required metadata fields, calculation formulas, label templates, and pass/fail criteria per application.
Is the ErgoClip™ adapter compatible with all volumetric flask sizes?
ErgoClip™ is available in configurations for common Class A flasks (10 mL to 2000 mL); custom fixtures can be engineered for non-standard geometries upon request.
How does the system handle uncertainty propagation in concentration calculations?
LabX® incorporates uncertainty budgets per USP and EURACHEM/CITAC guidelines, factoring in balance repeatability, readability, calibration uncertainty, flask tolerance, and temperature effects.
Can One Click™ be validated for GMP use?
Yes—METTLER TOLEDO provides IQ/OQ documentation templates, risk assessments (FMEA), and validation support services aligned with Annex 15 and ASTM E2500-13.