4WFB120 has been replaced by another product and is no longer available. Some accessories, replacement parts, or services may still be available.
On June 25, 2009, the 4WFBS120 replaced the 4WFB120. The 4WFBS120 provides the same functionality as the 4WFB120, but the new module has two external pins that allow customers to perform shunt calibrations.