Ceres Electronics Corporation designs and manufactures a variety of diamond and moissanite testers for the jewelry industry. Its products include CZeckpoint, Reliance AC, and CZeckpoint XL, Secure II and Dual XL. The company additionally provides a range of accessories, including pouches, pen assembly, boxes, rechargeable batteries and wall adaptors. It offers products under brand names, such as Diamond Probe II and Reliance. The company provides online repair and technical support services. Ceres Electronics Corporation s testers are used to differentiate between diamond, cubic zirconia and diamond simulants.