METTLER TOLEDO MR Precision Balance

Overview

The METTLER TOLEDO MR Precision Balance is an electromagnetically force-compensated (EMFC) analytical and precision weighing instrument engineered for high reproducibility, operational robustness, and regulatory compliance in regulated laboratory and industrial environments. Utilizing a closed-loop EMFC transducer architecture, the MR series delivers stable, drift-resistant measurements across ambient temperature fluctuations and mechanical disturbances—critical for applications requiring traceable mass determination per ISO/IEC 17025, USP , and ASTM E898. Designed and manufactured in Switzerland, each MR balance undergoes full factory calibration with certified reference masses and is supplied as a fully certified version compliant with OIML R76 and NTEP Class II/III requirements. The compact footprint, integrated anti-vibration design, and modular housing enable seamless deployment on benchtops, production lines, or mobile carts without compromising metrological integrity.

Key Features

• FACT (Fully Automatic Calibration Technology): Built-in motorized internal calibration weights enable automatic recalibration triggered by time, temperature drift (≥1.5 °C change), or user command—ensuring continuous traceability without manual intervention.
• 4.5-inch capacitive touchscreen interface: Intuitive icon-driven navigation supports glove-compatible operation and multilingual UI (English, German, French, Spanish, Chinese, Japanese).
• Robust mechanical architecture: All-metal housing with QuickLock draft shield (tool-free assembly/disassembly), overload protection up to 5× rated capacity, and IP54-rated electronics for dust/moisture resistance.
• Regulatory-ready firmware: Audit trail logging (user actions, calibration events, error codes), electronic signature support, and configurable access levels (Operator, Supervisor, Administrator) aligned with FDA 21 CFR Part 11 and EU Annex 11 expectations.
• Energy-efficient operation: Adaptive power management reduces standby consumption by >60% versus prior-generation models; auto-dimming and sleep mode comply with ENERGY STAR® v8.0 criteria.

Sample Compatibility & Compliance

The MR Precision Balance accommodates diverse sample formats via two standard pan configurations: a 120 mm diameter circular pan (MR203–MR603) optimized for small-volume vials, crucibles, and pipette tip trays; and a 180 × 180 mm square pan (MR1002–MR6002/MR6001) suited for larger containers, filter papers, or multi-well plates. All models meet OIML R76-1 (2021) accuracy class II and III specifications and carry NTEP Certificate of Conformance (CC) for legal-for-trade use in North America. Minimum weight validation adheres strictly to USP methodology (k = 2, tolerance 0.10%), with documented uncertainty budgets available upon request. Each unit ships with a Factory Calibration Certificate traceable to national standards (e.g., METAS, NIST) and includes GLP/GMP-compliant documentation packages for IQ/OQ/PQ protocols.

Software & Data Management

Data integrity and workflow integration are ensured through native connectivity options: dual USB ports (USB-A for flash storage, USB-C for high-speed device pairing), RS232 for legacy printer/scanner integration, and Gigabit Ethernet for networked deployment. Optional Bluetooth 5.0 enables wireless synchronization with mobile tablets or handheld scanners. The included EasyDirect™ Balance Software provides real-time data visualization, statistical process control (SPC) charting (X-bar/R, Cp/Cpk), and automated report generation (PDF, CSV, XML) with embedded metadata (timestamp, operator ID, balance serial number, calibration status). For enterprise environments, MT-SICS™ (METTLER TOLEDO Scientific Instrument Control System) supports centralized configuration management, remote diagnostics, and audit-log aggregation across heterogeneous instrument fleets.

Applications

• Pharmaceutical QC: Active pharmaceutical ingredient (API) dispensing, excipient blending verification, and stability study sample weighing per ICH Q5C.
• Chemical R&D: Stoichiometric reagent preparation, catalyst loading, and gravimetric titration standardization.
• Materials science: Powder density determination (ASTM D1895), ash content analysis (ASTM D3174), and composite formulation batch verification.
• Food & beverage: Nutrient labeling compliance (FDA 21 CFR 101.9), moisture loss tracking (AOAC 950.46), and portion control auditing.
• Environmental testing: Filter weighing for PM2.5/PM10 particulate matter analysis (EPA Method 201A), and soil organic carbon quantification (ISO 14235).

FAQ

Is the MR Precision Balance compliant with FDA 21 CFR Part 11?
Yes—when operated with enabled electronic signatures, audit trail logging, and role-based access control, the MR satisfies core Part 11 requirements for electronic records and signatures. Full validation documentation is provided in the GxP Support Kit.

What is the recommended recalibration frequency?
Per USP and ISO/IEC 17025, recalibration interval must be risk-assessed. FACT technology reduces need for manual intervention, but daily performance checks using certified check weights are advised for GxP workflows.

Can the MR connect to LIMS or ELN systems?
Yes—via Ethernet or USB-C, the balance exports structured data (including metadata and checksums) compatible with major LIMS (e.g., LabWare, Thermo Fisher SampleManager) and ELN platforms (e.g., Benchling, LabArchives) using ASTM E1384 or HL7 ADT messaging.

Does the MR support dynamic weighing or animal weighing modes?
No—MR models are optimized for static, high-accuracy mass measurement. Dynamic or motion-tolerant applications require dedicated instruments such as the METTLER TOLEDO XS or XP series.

How is environmental drift compensated during extended measurements?
The EMFC sensor incorporates real-time thermal compensation algorithms, while FACT recalibrates automatically upon detected ambient temperature shifts ≥1.5 °C—eliminating manual drift correction and ensuring long-term stability.