Apollo Command Module Block II Environmental Control System (ECS) Primary/Secondary Radiator Temperature Gauge. Gauge has two meters for measuring temperature. Gauge is in its original housing which has an affixed Weston Instruments, Inc. manufacturer’s label, which reads, in part: “Meter, Indicating, Electrical; Type 1B-L…Serial No. 097602430113.” This production representative for flight application gauge would be placed on Panel 2 of the main display console of the Command Module and monitor the radiator temperature. In fine condition.