OIML Class F2 calibration weights are intended for calibrating semi-analytical balances and for student use. They are a common choice for schools, colleges, universities, and general laboratories. At Scales Plus, we carry a large variety of calibration weights. For more questions about calibration weights and what kind would be best for you application, please contact us. You can reach us through the livechat, via email at firstname.lastname@example.org, or by calling 616-622-2100.