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- info@limrainstruments.com
- Vasai (E), Maharashtra
OIML Standard Weights Box Class F1-F2
Reliable Calibration Standards for Laboratory & Industrial Use
Accurate measurement begins with accurate reference standards. Limra Instruments manufactures high-quality OIML Standard Weights Boxes - Class F1 and Class F2 in India, designed for dependable calibration of precision balances and industrial weighing equipment.
Our F1 and F2 weight sets are engineered to provide stable mass values, consistent performance, and long-term reliability for laboratories, production facilities, and calibration service providers.
Understanding OIML Class F1 & F2 :
The OIML (International Organization of Legal Metrology) classification defines tolerance limits for calibration weights based on accuracy requirements.
- Class F1 :
Used for calibrating high-precision balances and for verification of M1 class weights.
Offers tight tolerance limits suitable for laboratory-grade applications - Class F2 :
Designed for calibration of medium-precision balances and for industrial weighing verification.
Ideal for routine calibration tasks where consistent performance is essential.
Limra Instruments manufactures both classes following controlled machining and verification processes.
Manufactured with Precision Engineering :
Our OIML F1 and F2 weights are produced using:
- Premium-grade stainless steel
- Fine surface finishing to reduce contamination
- Controlled density material
- Precision mass adjustment under monitored conditions
Each weight is individually tested to ensure conformity with specified tolerance limits.
Product Features :
- OIML-compliant Class F1 & F2 tolerances
- Non-magnetic stainless steel construction
- Clear and durable weight marking
- Protective wooden or aluminum storage box
- Individual cavities for each weight
- Optional calibration certificate
- Supplied with handling accessories (as required)
The storage case is designed to protect the weights from dust, moisture, and mechanical damage.
Applications :
Limra OIML F1 & F2 Standard Weights Boxes are widely used in:
- Industrial laboratories
- Quality control departments
- Calibration service centers
- Educational institutions
- Manufacturing plants
- Trade and inspection departments
They serve as secondary reference standards for maintaining weighing accuracy.
Available Weight Set Combinations :
We offer multiple configuration options such as:
- 1 mg to 100 g
- 1 mg to 200 g
- 1 mg to 500 g
- 1 mg to 1 kg
- Customized combinations as per customer requirement
Custom sets can be developed for specific calibration programs.
Quality Verification Process :
Every set undergoes:
- Precision mass adjustment
- Tolerance verification
- Surface inspection
- Stability testing
- Final quality approval
Only compliant weight sets are packed and dispatched.
Storage & Handling Integrity :
Proper storage is critical to maintaining calibration integrity. Our weight boxes feature:
- Precision-cut cavities
- Protective internal lining
- Secure locking mechanism
- Compact and organized design
This ensures safe transport and long-term stability.
Why Choose Limra Instruments?
- Indian manufacturer with precision-focused production
- OIML-compliant F1 and F2 tolerance standards
- Durable stainless steel construction
- Customizable weight set configurations
- Reliable after-sales and technical support
- Competitive pricing with consistent quality
We aim to provide dependable mass standards that support accurate and compliant weighing systems.
Trusted OIML F1 & F2 Weights Box Manufacturer in India
For laboratories and industries requiring dependable calibration standards, Limra Instruments offers precision-engineered OIML Class F1 and F2 Standard Weights Boxes designed for consistent performance and long service life.
Contact us today to discuss your calibration requirements and receive a customized quotation.
Technical Specifications :
| Class | F1 / F2 (1mg - 200gm) |
| Standard | OIML R111 |
| Material | 304 Stainless Steel |
| Construction | One or two pieces of same material |
| Cavity | May contain adjusting cavity |
| Density | 7.90g/cm³ / 7.85g/cm³ |
| Magnetic Susceptibility | < 0.005 |
| Intensity of Polarization | < 25 / < 35 |
| Shape | Cylindrical with knob |
| Finish | Mirror Polish |
| Packing Sets Weight | Aluminium alloy box |
| Packing Individual Weight (kg) | ABS Box (20kg, 10kg, 5kg, 2kg, 1kg) |
| Packing Individual Weight (g & mg) | ABS Box(500g to1g & 500mg to1mg, any) |
Frequently Asked Questions
What are OIML Class F1 and F2 standard weights used for?
F1 and F2 sit between the ultra-precise E classes and commercial M classes. F1 weights are commonly used to calibrate precision balances in jewellery, pharma QC, gemstone testing, and NABL-accredited labs. F2 weights work as commercial precision balance calibration and industrial working standards. If your balance reads to 0.01 g or 0.001 g, F1 or F2 is almost certainly right.
What weight denominations are typically included in an F1/F2 standard weight box?
A typical set covers 1 mg to 500 g (or 1 g to 1 kg), with denominations like 1 mg, 5 mg, 10 mg, 50 mg, 100 mg, 500 mg, 1 g, 5 g, 10 g, 50 g, 100 g, and 500 g letting you test your balance across its full range. Weights come in a fitted case with individual compartments for protection.
How often should F1/F2 calibration weights be recalibrated?
Annually for most industrial and lab use in India. In high-use settings or regulated sectors like pharma manufacturing or NABL labs, every 6 months may be more appropriate. Since the traceability chain runs back to your standard weights' condition, keeping them freshly calibrated matters as much as calibrating the balance itself.
Are Limra F1/F2 standard weights supplied with individual or batch calibration certificates?
Yes, available either way depending on your requirement. NABL labs and ISO-certified systems generally prefer individual weight certificates traceable to national standards (NPL India or equivalent), while a set-level certificate suffices for general industrial use. Mention your documentation need when ordering.
Can F1/F2 weights be used to calibrate table top scales and platform scales?
Q5. Can F1/F2 weights be used to calibrate table top scales and platform scales? They can, but they're not the most cost-effective choice. F1/F2 weights are designed for milligram or low-gram precision balances; for table top scales (LMS/LMT) or platform scales (LMP) reading in grams or tens of grams, OIML M1/M2 or cast iron weights are more practical. We can help match the right calibration class to each instrument in your facility.