Check the listing for details. Antique Scientific Analytical Balance Calibration weights. Condition: Used. Listed at 100.00 USD. Vintage analytical weight set (1 mg -300 mg). Mint condition. Very likely never used. Beautiful woodwork and design. Perfect for collectors of high quality, scientific equipment. Highly amusing Y2K error. Typical recalibration was done yearly. The technician struggled unsuccessfully to determine next calibration date from 6/24/99!