AKCP Announces NIST Calibrated Temperature Sensors With Accuracy Check and Automatic Failover. The world’s oldest and largest supplier of network-enabled sensors releases an updated range of temperature sensors. The NIST2 sensors feature 2x NIST traceable, calibrated temperature sensors and an internal calibration integrity check. NIST4 sensors feature 4x NIST traceable, calibrated sensors with internal calibration integrity check and failover.