METTLER TOLEDO ME203E Precision Balance
| Brand | METTLER TOLEDO |
|---|---|
| Origin | Shanghai, China |
| Model | ME203E |
| Instrument Type | Precision Balance |
| Maximum Capacity | 220 g |
| Readability | 0.001 g |
| Repeatability | 0.001 g |
| Linearity | ±0.002 g |
| Calibration Method | External (using certified weights) |
| Pan Size | 120 mm diameter |
| Draft Shield Height | 170 mm |
| Dimensions (W×D×H) | 210 × 319 × 289 mm |
| Power Supply | AC adapter (included) |
Overview
The METTLER TOLEDO ME203E Precision Balance is an entry-level analytical-grade weighing instrument engineered for routine laboratory and quality control applications requiring consistent 1 mg readability and high repeatability. Based on electromagnetic force compensation (EMFC) transduction technology, the ME203E delivers stable, drift-resistant measurements under variable ambient conditions—including minor air currents, temperature fluctuations, and bench vibrations—common in shared lab environments. Its robust metal frame, reinforced housing, and integrated leveling feet ensure mechanical stability across extended operational cycles. Designed for ISO/IEC 17025-compliant workflows, the balance supports traceable mass measurement through external calibration with Class F1 or better certified weights, aligning with ASTM E898, USP , and ISO 9001 documentation requirements.
Key Features
- Electromagnetic force compensation (EMFC) sensor architecture ensures fast stabilization (<2 seconds), low drift (<0.001 g/30 min), and long-term signal integrity.
- Bright, backlit LCD display with 18-mm high digits enables clear readability under low-light or high-glare conditions—critical for multi-shift operations.
- One-touch external calibration interface simplifies compliance with daily verification protocols; calibration status is displayed continuously.
- Ergonomic front-panel layout places tare, unit toggle, and print functions within natural thumb reach—reducing operator fatigue during high-frequency weighing tasks.
- Stainless-steel weighing pan (Ø120 mm) and chemically resistant housing support routine cleaning with ethanol or 70% isopropanol—fully compatible with GLP/GMP hygiene standards.
- Integrated draft shield (170 mm effective height) minimizes convective interference without compromising sample accessibility or workflow speed.
- Front-access leveling feet with visual bubble indicator allow rapid horizontal alignment—no tools required.
Sample Compatibility & Compliance
The ME203E accommodates a broad range of solid and granular samples—from pharmaceutical powders and chemical reagents to polymer pellets and food ingredients—within its 220 g capacity and 120 mm pan diameter. Its open-frame design permits easy placement of beakers, crucibles, and filtration assemblies. The balance meets essential regulatory expectations for non-automatic weighing instruments per OIML R 76-1 (2021) and is suitable for applications governed by FDA 21 CFR Part 11 when paired with METTLER TOLEDO LabX Lite software (optional). All internal firmware adheres to IEC 61326-1 EMC and safety standards. Documentation includes factory calibration certificate (traceable to NIM, China), conformity declaration, and user manual compliant with ISO/IEC Guide 98-3 (GUM).
Software & Data Management
While the ME203E operates as a standalone instrument, it features RS232 and USB Device interfaces for seamless integration into regulated data environments. When connected to a PC running METTLER TOLEDO LabX Lite (freely downloadable), users gain automated data logging, customizable report templates (PDF/CSV), electronic signature support, and audit trail generation—meeting ALCOA+ principles for data integrity. The balance’s real-time serial output includes timestamped weight values, stability indicators, and calibration event flags—enabling direct import into LIMS or ELN systems without manual transcription. Optional thermal printer compatibility supports immediate hard-copy record retention per ISO 15197 or internal SOPs.
Applications
- Pharmaceutical QC: Tablet weight uniformity testing (USP ), active ingredient assay preparation, and excipient dispensing.
- Chemical synthesis: Stoichiometric reagent dosing, yield calculation, and reaction mixture monitoring.
- Materials science: Density determination via pycnometry, powder flow characterization, and composite formulation.
- Food & beverage: Nutritional labeling compliance (FDA 21 CFR 101), moisture content pre-weighing, and portion control validation.
- Academic teaching labs: Fundamental mass measurement training, error propagation exercises, and gravimetric analysis instruction.
FAQ
What calibration weights are required for the ME203E?
A single 200 g Class F1 (or better) certified weight is sufficient for full-span verification and adjustment per manufacturer specifications.
Does the ME203E support internal calibration?
No—the ME203E uses external calibration only; internal motorized calibration is available only on higher-tier models (e.g., ME-T series).
Can the balance be used in a fume hood?
Yes, provided the hood airflow is stabilized below 0.5 m/s at the pan level and the unit is mechanically isolated from vibration sources.
Is the display readable in direct sunlight?
The high-contrast backlit LCD maintains legibility under ambient illumination up to 10,000 lux; however, prolonged exposure to UV radiation may degrade the polarizer over time.
What is the warm-up time before first use?
Minimum 30 minutes at stable room temperature (20–25 °C) is recommended to achieve thermal equilibrium and optimal repeatability.
