Zwiebel OIML Weights: E1 & E2 classes. Class E1 weights are intended to ensure traceability between national mass standards and weights of a lower accuracy class. Class E2 weights are intended for use in the calibration of weights of a lower accuracy class and for use with weighing instruments of special accuracy class 1. Weights can be supplied either individually, or in sets in foam lined plastic or velvet lined wooden cases.

• An example of E2 weight set includes:
• Velvet-lined wooden case
• 24 weights ranging from 1mg to 500g
• Tweezers
• Glass protection for wires