OIML Standard Weights – E1 / E2 / F1 Class (OIML R111 Certified | Calibration Weights | Stainless Steel Construction)

OIML Standard Weights E1, E2 and F1 Class are precision calibration weights manufactured in accordance with OIML R111 standards for calibration laboratories, metrology institutes, analytical laboratories and precision weighing applications. These weights are designed to provide traceable mass standards for calibration and verification of balances, analytical balances, micro balances and precision weighing instruments.

Available in E1, E2 and F1 accuracy classes, the weights are manufactured from high-grade stainless steel materials with precision-machined cylindrical construction and mirror-polished finishes to ensure long-term stability and repeatable measurement performance. The weights are supplied in protective aluminium alloy or ABS storage cases to prevent contamination and maintain calibration integrity.

E1 Class weights are intended for primary reference standards and high-level calibration applications. E2 Class weights are suitable for calibration of micro, semi-micro and analytical balances requiring very high accuracy. F1 Class weights are widely used for calibration of high precision balances and loading balances with readability up to 0.001g.

These calibration weights are available as individual weights or complete weight sets covering milligram to kilogram ranges. NABL-accredited calibration certificates can also be provided as an optional service for traceable calibration requirements.

Key Features

Manufactured according to OIML R111 standards
Available in E1, E2 and F1 accuracy classes
Precision stainless steel construction
Mirror polished finish
High dimensional and mass stability
Suitable for calibration laboratories
Available as individual weights or complete sets
Protective aluminium alloy storage cases
ABS protective boxes for smaller weights
Excellent corrosion resistance
Low magnetic susceptibility
Traceable calibration capability
Optional NABL calibration certification
Long-term calibration stability
Suitable for analytical and micro balances

Technical Specifications

Available Weight Ranges

E1 Class

1mg to 500g (24-piece set)
1mg to 200g (23-piece set)
1mg to 500mg (12-piece set)
Individual weights from 1mg to 20kg

E2 Class

1mg to 500g (24-piece set)
1mg to 200g (23-piece set)
1mg to 500mg (12-piece set)
Individual weights from 1mg to 20kg

F1 Class

1mg to 2kg (27-piece set)
1mg to 1kg (25-piece set)
1mg to 500g (24-piece set)
1mg to 200g (23-piece set)
1mg to 500mg (12-piece set)
Individual weights from 1mg to 20kg

Applications

Calibration laboratories
Metrology laboratories
Analytical balance calibration
Micro balance calibration
Semi-micro balance calibration
Precision balance verification
Pharmaceutical laboratories
Research laboratories
Quality control departments
Educational institutions
Industrial calibration facilities
Mass standard reference laboratories
Accredited testing laboratories
Scientific research applications
Measurement traceability programs