1800SCALES.com offers only the best calibration and test weights. Our suppliers have been supplying high-quality precision measurement products and services for over 25 years. The combination of world class manufacturing technology, an experienced staff of professionals, and a commitment to total quality enables our weight suppliers to lead the industry in attaining a variety of quality certifications including ISO 9000 and ISO/IEC 17025. Note: Also please note the kit pictures are for reference only. Please see product description for the specific items in each kit. Please carefully make your weight selections as we do not accept returns.