OIML Weight Classification Overview :
Selecting the correct OIML weight class is essential for achieving dependable calibration results. Limra Instruments offers a complete range of OIML-compliant weight classes to match different scale readabilities and operational requirements.
Class E1 and Class E2 - High-Precision Reference Standards :
- Class E1 :
Class E1 weights represent the highest level of metrological accuracy and are used as primary reference standards in national metrology laboratories and for calibrating Class E2 weights. - Class E2 :
Class E2 weights are suitable for calibrating high-end analytical balances with readabilities of 0.1 mg and 0.01 mg. - These weights are manufactured from premium non-magnetic stainless steel and feature a mirror-polished surface to minimize dust adhesion and environmental influence.
Class F1 and Class F2 - Laboratory and Industrial Precision :
- Class F1 :
Class F1 weights are recommended for calibrating precision balances with readabilities ranging from 0.001 g to 0.01 g and are widely used in pharmaceutical laboratories, research facilities, and quality control environments. - Class F2 :
Class F2 weights are designed for high-accuracy industrial scales and for calibrating Class M1 weights. They are commonly used in precious metal and gold weighing applications where consistent precision is essential.
Class M1 and Class M2 - Industrial and Commercial Calibration :
- Class M1 :
Class M1 weights are the standard choice for industrial platform scales and legal-for-trade commercial weighing systems. - Class M1 :
Class M2 weights provide an economical solution for general commercial transactions and medium-accuracy industrial applications. - These weights are available in stainless steel or high-grade brass with protective surface coatings to ensure durability and long-term stability.
Features of Limra Instruments OIML Standard Weight Boxes.
Every Limra OIML Standard Weight Boxes is supplied with certified calibration traceable to national and international standards, including NABL and RRSL. Standard sets are available in configurations ranging from 1 mg to 200 g, 1 mg to 500 g, and extended kits up to 1 kg and 5 kg, depending on application requirements.
The weights are housed in precision-engineered wooden or aluminum cases with anti-static velvet lining to protect against scratches, contamination, and handling damage. Each set includes precision forceps or tweezers and protective gloves, ensuring proper handling and preventing oil or moisture transfer from direct contact.
Application Compatibility Summary :
- OIML Standard Weight Boxes :
Class E1 and E2 weights are recommended for reference standards and micro-balance calibration corresponding to Class I (special accuracy) weighing instruments. - OIML Standard Weight Boxes :
Class F1 and F2 weights are suitable for analytical and precision balances operating under Class I and Class II (high accuracy) categories. - OIML Standard Weight Boxes :
Class M1 and M2 weights are intended for industrial and commercial scales classified under Class III (medium accuracy).
Why Choose Limra Instruments, Vasai
Located in Sativali, Vasai, Limra Instruments understands the stringent calibration and compliance requirements of Indian laboratories and manufacturing facilities.
Our technical team provides expert guidance to help customers select the appropriate OIML weight class based on scale readability, following the internationally accepted 1/3 readability rule. In addition to supply, Limra Instruments offers periodic recalibration and recertification services, helping customers maintain long-term compliance and audit readiness.
Every weight undergoes strict quality checks for magnetic susceptibility, density, and dimensional stability, ensuring consistent performance and long-term accuracy.