Radwag Ultra-Microbalances – Sub-Microgram Precision for the Most Demanding Scientific Applications
Radwag ultra-microbalances represent the pinnacle of precision weighing technology, achieving readability to 0.0001 mg (0.1 μg) and below for the most demanding scientific, metrological, and pharmaceutical applications where conventional analytical balances cannot provide sufficient resolution. Manufactured in Poland by Radwag — one of Europe’s leading precision weighing instrument manufacturers and a recognised specialist in ultra-high accuracy mass measurement — their ultra-microbalance range combines electromagnetic force restoration (EMFR) weighing technology with advanced environmental compensation and vibration isolation to deliver stable, repeatable sub-microgram measurements in real-world laboratory conditions.
Ultra-microbalances are used in applications where the mass of the sample itself is at the very limits of what can be reliably measured — thin film deposition monitoring, nanoparticle characterisation, trace substance analysis, pharmaceutical impurity testing, and the calibration of the highest-accuracy reference weights. At this level of resolution, environmental factors including temperature fluctuations, air currents, vibration, electrostatic charge, and even the buoyancy effect of air on the sample become significant sources of measurement uncertainty. Radwag ultra-microbalances address these challenges through built-in environmental sensors, automatic buoyancy correction, anti-static ionisers, active or passive anti-vibration systems, and fully enclosed draft chambers — providing the stable measurement environment needed to realise the instrument’s full resolution in practice.
Key Features
- Readability to 0.0001 mg (0.1 μg) for sub-microgram precision in the most demanding applications
- Electromagnetic force restoration (EMFR) technology for the highest accuracy and linearity
- Active or passive anti-vibration system for stable readings in real-world laboratory environments
- Fully enclosed draft chamber to eliminate air current interference at sub-microgram resolution
- Anti-static ioniser to neutralise electrostatic charge on samples and containers
- Automatic air buoyancy correction using built-in environmental sensors
- Automatic internal calibration with motorised reference weights for continuous accuracy
- GLP and ISO 17025 compliant output with full measurement traceability documentation
Common Applications
- Pharmaceutical impurity testing — sub-microgram weighing of reference standards and trace impurities
- Thin film and coating analysis — mass measurement of deposited films and surface coatings
- Nanoparticle and nanomaterial characterisation — mass determination of nano-scale samples
- Weight calibration — calibration of OIML Class E1 reference weights at the highest accuracy level
- Environmental and trace analysis — gravimetric determination of trace substances in air, water, and soil
- Materials science research — ultra-precise mass measurement for advanced materials characterisation
All Radwag ultra-microbalances are available with UKAS-traceable calibration certificates on request. Contact our technical team for advice on the right model for your application, environmental requirements, and accuracy class.
Frequently Asked Questions
What is the difference between a microbalance and an ultra-microbalance?
A microbalance typically offers readability of 0.001 mg (1 μg). An ultra-microbalance achieves readability of 0.0001 mg (0.1 μg) or finer — ten times more sensitive. At this resolution, environmental control and sample handling technique become critical factors in achieving reliable results. Ultra-microbalances are used only where this extreme resolution is genuinely required by the application.
What environmental conditions are required for a Radwag ultra-microbalance?
Ultra-microbalances require a stable, vibration-free environment with tightly controlled temperature and humidity, and minimal air movement. A dedicated metrology room or vibration-isolated laboratory bench is strongly recommended. Radwag ultra-microbalances include built-in environmental sensors, anti-vibration systems, and fully enclosed draft chambers to maximise performance in real-world conditions, but the quality of the installation environment remains a significant factor in achievable measurement uncertainty.
How should samples be handled when using an ultra-microbalance?
At sub-microgram resolution, sample handling technique is critical. Always use tweezers, gloves, or non-contact handling tools — never bare hands. Allow samples to equilibrate to room temperature before weighing. Use the anti-static ioniser to neutralise electrostatic charge on samples and containers. Close all draft chamber doors before taking a reading and allow the reading to stabilise fully before recording.
Are Radwag ultra-microbalances suitable for ISO 17025 accredited laboratories?
Yes. Radwag ultra-microbalances are designed for use in ISO 17025 accredited calibration and testing laboratories, with GLP-compliant output, full measurement traceability documentation, and automatic internal calibration. UKAS-traceable calibration certificates are available on request. Contact our team for guidance on documentation requirements for your accreditation scope.
Are UKAS calibration certificates available?
Yes. UKAS-traceable calibration certificates are available on request for all Radwag ultra-microbalances. Contact our team when ordering to arrange appropriate calibration documentation for your application and accreditation requirements.
