Radwag Mass Comparators – Ultra-High Precision Weighing for Calibration & Metrology
Radwag mass comparators are ultra-high precision weighing instruments designed for the calibration and verification of reference weights, the dissemination of mass standards, and the most demanding metrological and scientific weighing applications. Manufactured in Poland by Radwag — one of Europe’s leading precision weighing instrument manufacturers and a recognised specialist in high-accuracy mass metrology — their mass comparator range achieves readability to 0.001 mg (1 μg) and below, with exceptional repeatability and minimum sensitivity to environmental disturbances.
Unlike a conventional analytical balance, a mass comparator is specifically designed for the comparative weighing method — measuring the difference in mass between a reference standard and an unknown weight rather than determining absolute mass directly. This approach eliminates many of the systematic errors inherent in direct weighing, delivering the highest possible accuracy for weight calibration and mass determination. Radwag mass comparators are used by national metrology institutes, accredited calibration laboratories, pharmaceutical quality assurance, precious metals assay, and any application where the highest level of mass measurement accuracy and traceability is required. Advanced environmental compensation, automatic internal calibration, and sophisticated software for ABBA and ABA substitution weighing sequences are standard features across the range.
Key Features
- Readability to 0.001 mg (1 μg) for ultra-high precision mass determination and weight calibration
- Comparative weighing design for minimum systematic error in weight calibration applications
- Automatic internal calibration with motorised reference weights for continuous accuracy
- ABBA and ABA substitution weighing sequences for highest-accuracy comparative mass determination
- Advanced environmental compensation for temperature, air buoyancy, and vibration
- Anti-vibration system for stable readings in real-world laboratory and metrology environments
- GLP and ISO 17025 compliant output with full measurement traceability documentation
- Ethernet, RS-232, and USB connectivity for LIMS and calibration software integration
Common Applications
- National and secondary metrology — dissemination of mass standards and calibration of reference weights
- Accredited calibration laboratories — ISO 17025 accredited weight calibration services
- Pharmaceutical quality assurance — reference weight calibration and high-accuracy API weighing
- Precious metals and assay — ultra-precise gold, silver, and platinum mass determination
- Research and development — high-accuracy mass measurement for scientific research
- Gem and diamond grading — ultra-precise carat weight determination for high-value gemstones
All Radwag mass comparators are available with UKAS-traceable calibration certificates on request. Contact our technical team for advice on the right comparator for your accuracy class, capacity, and application requirements.
Frequently Asked Questions
What is the difference between a mass comparator and an analytical balance?
An analytical balance measures the absolute mass of a sample directly. A mass comparator is designed to measure the difference in mass between two objects — typically a reference standard and an unknown weight — using substitution weighing sequences (ABBA or ABA). This comparative approach eliminates many systematic errors and achieves significantly higher accuracy than direct weighing, making mass comparators the instrument of choice for weight calibration and mass metrology applications.
What OIML accuracy classes can Radwag mass comparators calibrate?
Radwag mass comparators are available in configurations suitable for calibrating OIML Class E1, E2, F1, and F2 weights, depending on the model’s readability, repeatability, and capacity. Contact our team with your required accuracy class and weight range and we’ll identify the correct comparator specification for your calibration requirements.
Are Radwag mass comparators suitable for ISO 17025 accredited laboratories?
Yes. Radwag mass comparators are designed for use in ISO 17025 accredited calibration laboratories, with GLP-compliant output, full measurement traceability documentation, and software support for ABBA and ABA substitution weighing sequences. UKAS-traceable calibration certificates are available on request. Contact our team for guidance on documentation and software requirements for your accreditation scope.
What environmental conditions are required for a mass comparator?
Mass comparators require a stable, vibration-free environment with controlled temperature and humidity for optimal performance. Most Radwag comparators include built-in environmental sensors and compensation algorithms, but for the highest accuracy (Class E1 and E2 calibration), a dedicated temperature-controlled metrology room is recommended. Contact our team for guidance on environmental requirements for your specific application.
Are UKAS calibration certificates available?
Yes. UKAS-traceable calibration certificates are available on request for all Radwag mass comparators. For ISO 17025 accredited laboratories, the calibration certificate must be traceable to national standards — contact our team to arrange appropriate calibration documentation for your accreditation requirements.
