METTLER TOLEDO ML203T Precision Balance

Overview

The METTLER TOLEDO ML203T Precision Balance is an entry-level analytical-grade instrument engineered for reliable mass determination in laboratory, quality control, and production environments where sub-milligram resolution and high reproducibility are required. Operating on electromagnetic force compensation (EMFC) principle, the ML203T delivers stable, drift-compensated measurements across ambient temperature fluctuations—enabled by its integrated FACT (Fully Automatic Calibration Technology) system with internal reference weights. Designed to meet the fundamental requirements of ISO/IEC 17025-accredited laboratories, it supports routine weighing tasks including formulation, check-weighing, and density determination without requiring external calibration tools. Its compact footprint and dual-power capability (AC mains or internal battery) enhance flexibility in both fixed workstations and mobile applications.

Key Features

• 1 mg readability with 220 g maximum capacity—optimized for mid-range precision tasks where sensitivity exceeds standard top-loading balances but full analytical performance is not required.
• Internal FACT calibration ensures long-term stability: automatic adjustment triggered by temperature change (>1.5 °C) or time interval (user-configurable), eliminating manual recalibration errors.
• 4.5-inch full-color TFT touchscreen interface with intuitive icon-driven navigation—supports multi-language operation and customizable user profiles.
• Dual power architecture: seamless transition between AC power supply and built-in rechargeable battery (up to 8 hours continuous operation), enabling use in temporary setups or locations without stable electrical infrastructure.
• Robust mechanical design: die-cast aluminum base provides vibration damping and thermal mass stability; ABS housing resists common lab solvents and mechanical abrasion.
• Comprehensive connectivity suite: RS232 for legacy serial printers/data loggers, USB Device for direct PC communication, and USB Host for plug-and-play peripherals (e.g., barcode scanners, USB storage).

Sample Compatibility & Compliance

The ML203T accommodates samples up to 120 mm in diameter on its stainless-steel pan, supporting volumetric containers, weighing boats, crucibles, and small-part fixtures. While not certified for legal-for-trade applications (e.g., retail or pharmaceutical dispensing under NTEP/OIML), it complies with key metrological standards relevant to laboratory practice—including ISO 9001 process control, USP and minimum weight guidelines, and ASTM E898–19 for balance verification protocols. Its repeatability (≤1 mg at 100 g load) and linearity error (±0.002 g) satisfy GLP documentation requirements when paired with audit-trail-enabled software. The instrument’s temperature coefficient of ±3 ppm/°C ensures traceable performance across typical lab environments (10–30 °C).

Software & Data Management

Data export and integration are facilitated via METTLER TOLEDO’s free LabX Lite software (compatible with Windows 10/11), which enables automated report generation, CSV/Excel export, and basic statistical analysis (mean, SD, CV%). All weighing events—including timestamp, operator ID, sample ID, and environmental metadata (if connected to optional temperature/humidity sensor)—are logged with immutable timestamps. While the ML203T does not natively support FDA 21 CFR Part 11 electronic signature or full audit trail functionality, its data output format is compatible with validated third-party LIMS and ELN systems that enforce electronic record integrity per GxP requirements.

Applications

• Formulation & Dispensing: Accurate mass-based addition of reagents in chemical synthesis and pharmaceutical pre-formulation studies.
• Check Weighing: Verification of filled container weights against upper/lower tolerance limits in packaging QA/QC workflows.
• Counting: Piece-counting of uniform small parts (e.g., screws, tablets, connectors) using average piece weight calculation.
• Density Determination: Integration with METTLER TOLEDO density kits for solid/liquid density measurement per ISO 1183 and ASTM D792.
• Percent Weighing: Relative mass comparison against a reference sample (e.g., % recovery in extraction protocols).
• Totalizing: Cumulative mass summation across multiple additions—common in batching and raw material reconciliation.

FAQ

Is the ML203T compliant with USP minimum weight requirements?
Yes—the typical minimum weight is 1.4 g at 0.1% RSD, satisfying USP criteria for most non-critical weighing applications when operated under controlled environmental conditions.
Does it support external calibration with certified weights?
No—the ML203T is factory-configured for internal FACT calibration only; external calibration is neither supported nor required per manufacturer specifications.
Can the balance be used in a fume hood?
Yes, provided airflow is minimized near the weighing chamber; the unit’s draft shield compatibility (optional accessory) is recommended for volatile or static-prone samples.
What is the battery life under continuous use?
Approximately 8 hours at room temperature with default screen brightness and no peripheral activity; battery status is displayed in real time on the touchscreen.
Is firmware upgrade possible in the field?
Yes—firmware updates are distributed via USB drive using METTLER TOLEDO’s official update utility and require no service technician intervention.