The Bacharach's B-Smart sensors allow for easy field replacement with a pre-calibrated sensor. Eliminate the need to send your equipment in for annual calibration, and always have your analyzer reading accurately and ready to go. Just snap in your sensor, enter the B-Smart code displayed on the sensor label, and get back to work. Each B-Smart sensor comes with a certificate of calibration for your internal compliance recordkeeping, giving you the confidence that your analyzer is accurate every time.