Ultra-Micro Balances – Sub-Microgram Precision Weighing to 0.0001 mg (0.1 μg)
Our ultra-micro balances represent the absolute pinnacle of laboratory weighing technology, offering readability down to 0.0001 mg (0.1 microgram — 100 nanograms) for the measurement of the smallest sample quantities encountered in scientific research. Positioned above semi-micro and microbalances in the precision hierarchy, ultra-micro balances are specialist instruments used in the most demanding analytical, pharmaceutical, and metrological applications where no other weighing technology can provide sufficient resolution.
At sub-microgram resolution, the challenges of accurate weighing are extreme. Air currents, vibration, electrostatic charge, temperature gradients, humidity, and even the breath of a nearby operator can introduce errors that exceed the measurement itself. Ultra-micro balances are therefore engineered with the most advanced environmental protection available: fully sealed, temperature-controlled weighing chambers, motorised anti-draft doors, multi-stage anti-vibration systems, integrated ionisation, and real-time environmental monitoring. Automatic internal calibration using precision motorised reference weights maintains accuracy continuously. These instruments are typically installed in dedicated weighing rooms or enclosures with controlled temperature, humidity, and vibration levels to achieve their rated performance.
Key Features
- Readability to 0.0001 mg (0.1 μg / 100 ng) for the most demanding sub-microgram weighing applications
- Capacities typically from 2 g to 10 g suited to ultra-small reference and analytical samples
- Fully sealed, temperature-controlled weighing chamber for maximum thermal stability
- Motorised anti-draft doors to eliminate air disturbance during sample loading
- Multi-stage anti-vibration system for stable readings in real laboratory environments
- Integrated ionisation to neutralise electrostatic charge on samples and containers
- Automatic internal calibration with motorised reference weights for continuous accuracy
- GLP/GMP compliance features — audit trail, user management, and full method documentation
Common Applications
- Pharmaceutical research — potent compound and highly active API weighing at nanogram scale
- Metrology and mass calibration — reference weight calibration and mass comparator applications at the highest accuracy level
- Environmental science — ultra-trace particulate filter weighing for air quality monitoring (PM1, PM2.5)
- Materials science — nano-material, thin film, and coating mass determination at sub-microgram scale
- Forensic and toxicology laboratories — trace substance quantification at the limits of detection
- Biotechnology — nucleic acid, protein, and enzyme weighing for advanced molecular biology research
Ultra-micro balances are specialist instruments requiring careful installation, environmental control, and operator training to achieve their rated performance. All models are sourced from leading laboratory instrument manufacturers and are available with UKAS-traceable calibration certificates on request. Contact our technical team to discuss your application, installation requirements, and regulatory needs before ordering.
Frequently Asked Questions
What is the difference between an ultra-micro balance, a microbalance, and a semi-micro balance?
The hierarchy by readability is: semi-micro balance (0.01 mg / 10 μg), microbalance (0.001 mg / 1 μg), and ultra-micro balance (0.0001 mg / 0.1 μg). Each step represents a tenfold increase in sensitivity and a corresponding increase in the environmental control and operator care required to achieve accurate results. Ultra-micro balances are used only when microbalance resolution is insufficient for the application.
What installation environment is required for an ultra-micro balance?
Ultra-micro balances require a dedicated, controlled weighing environment: a vibration-isolated surface (active anti-vibration table), stable temperature (typically ±0.5°C or better), controlled humidity, and a draught-free enclosure. Many users install them in a dedicated weighing room or glove box. The balance should be powered on and allowed to stabilise for at least one hour before use, and samples must be fully equilibrated to the room temperature before weighing.
How do I handle samples at sub-microgram scale?
Sample handling at this resolution requires specialist technique: use non-contact tools (fine forceps, micro-spatulas) and anti-static containers; never handle samples or containers with bare hands; allow all items to fully equilibrate to room temperature; use the integrated ioniser before and during weighing; close all doors and wait for full stability before recording. Even minor disturbances — a door opening nearby, a passing vehicle — can affect readings at this resolution.
Do ultra-micro balances comply with GLP and GMP requirements?
Yes. All models in our range include comprehensive GLP/GMP compliance features: user login and access management, audit trail logging, date/time and instrument ID stamping, and method-guided workflows. Full IQ/OQ/PQ validation documentation and test protocols are available on request for pharmaceutical, medical device, and other regulated laboratory environments.
Can I get a UKAS calibration certificate with my ultra-micro balance?
Yes. UKAS-traceable calibration certificates are available on request. Given the extreme sensitivity of these instruments, calibration should be performed by a qualified metrologist or manufacturer service engineer, and routine daily verification with certified reference weights is essential. Contact our technical team to discuss calibration, service, and installation support before purchasing.
