Metler Toledo AT Series Used Analytical Balances

Overview

The Mettler Toledo AT Series Used Analytical Balances — including the AT20 (20 g capacity, 0.01 mg readability), AT200 (200 g capacity, 0.1 mg readability), and AT261 DeltaRange® (261 g capacity with dual-range functionality: 0.01 mg up to 100 g; 0.1 mg from 100–261 g) — represent a rigorously validated class of high-precision mass measurement instruments originally engineered for GLP-compliant laboratory environments. These units operate on electromagnetic force compensation (EMFC) principle, delivering stable, drift-compensated readings under controlled ambient conditions. Each unit undergoes full functional verification at SpectraLab Scientific’s ISO/IEC 17025-aligned technical facility, including repeatability testing (n ≥ 10 at 5%, 50%, and 100% load), eccentricity assessment across all quadrants, linearity verification per OIML R76, and internal calibration weight validation. Units are supplied with documented verification reports, confirming compliance with metrological requirements for routine analytical weighing in QC, research, and method development workflows.

Key Features

• Electromagnetic force compensation (EMFC) sensor architecture ensuring long-term stability and minimal thermal drift
• DeltaRange® technology (AT261 only): dual-interval readability optimized for both ultra-trace and mid-range sample handling without manual range switching
• Integrated draft shield with ergonomic sliding doors (standard on AT200 & AT261; optional on AT20)
• RS232 and USB interfaces supporting bidirectional data transfer to LIMS or Excel-based tracking systems
• Internal calibration routine with motorized mass actuation — fully operational post-refurbishment and verified during pre-shipment test
• Stainless steel weighing pan and draft shield components resistant to common solvents and cleaning agents
• Front-panel navigation with intuitive icon-driven menu system compliant with IEC 61000-4 EMC standards

Sample Compatibility & Compliance

These refurbished AT balances accommodate standard laboratory sample vessels including weighing boats, crucibles, vials, and filter papers. Maximum pan diameter (AT200/AT261: 90 mm; AT20: 70 mm) ensures compatibility with volumetric flasks and small reaction vessels. All units meet OIML R76-1 Class I accuracy requirements for analytical applications and support traceability under ISO/IEC 17025 when used with certified reference weights. While not supplied with full GMP documentation packages, they are suitable for non-regulated research use and regulated QC environments where instrument qualification (IQ/OQ) is performed by the end user per ASTM E898 and USP . No firmware modifications have been applied; original Mettler Toledo firmware versions remain intact and upgradable via standard service protocols.

Software & Data Management

The AT series supports native Mettler Toledo LabX Lite software (freely downloadable) for basic data export, statistical analysis, and report generation. RS232 output delivers real-time ASCII-formatted data streams compatible with third-party acquisition platforms including LabWare LIMS, Thermo Fisher SampleManager, and custom Python/Node.js parsing scripts. Audit trail functionality is not embedded in hardware but can be implemented externally via timestamped serial logging. Units retain factory-default communication settings (9600 baud, 8N1), enabling plug-and-play integration into existing lab networks. No cloud connectivity or remote access features are enabled — consistent with security policies governing legacy instrumentation in regulated labs.

Applications

• Quantitative gravimetric preparation of standard solutions and reference materials
• Weighing of active pharmaceutical ingredients (APIs) and excipients in formulation development
• Residue-on-ignition (ROI) and loss-on-drying (LOD) determinations per USP
• Calibration of pipettes and volumetric glassware using water density correction methods
• Microgram-level catalyst dosing in synthetic chemistry workflows
• Quality control of powder blends in food and nutraceutical manufacturing

FAQ

Are these units covered by Mettler Toledo’s original manufacturer warranty?
No. As refurbished second-hand instruments, they carry a 6-month limited warranty administered directly by SpectraLab Scientific, covering functional defects in materials and workmanship.
Is calibration certificate included with shipment?
Yes — each unit ships with a SpectraLab-issued verification report detailing repeatability, linearity, and eccentricity test results. NIST-traceable calibration certificates are available upon request at additional cost.
Can I perform IQ/OQ qualification using these balances?
Yes. All mechanical and electronic subsystems retain OEM design integrity. Documentation packages (including electrical schematics and service manuals) are available through Mettler Toledo’s authorized channel upon proof of ownership.
What refurbishment procedures are performed prior to resale?
Units undergo full disassembly, optical inspection of EMFC sensor coil and magnet assembly, replacement of worn mechanical components (dampers, leveling feet, draft shield hinges), firmware reset to factory defaults, and 72-hour environmental stabilization before final verification.
Do you offer installation or on-site support?
Remote technical assistance is provided free of charge. On-site installation, qualification, or training services are available globally through our network of certified field engineers — quoted separately based on location and scope.