VECTOR Duct Humidity and Temperature Transmitter, SDC-H1T1-08, SDC-H1T1-16, SDC-H1T1-24, SDC-H1T1-08-A3, SDC-H1T1-16-A3, SDC-H1T1-24-A3, SDC-H1-16, SDC-T1-08, SDC-T1-16, SDC-T1-24