Apollo SI-B firing room ground support control panel. Panel measures 19 x 17.5 x 19 and is labeled along the bottom edge, “S-IB Measuring & RF.” Panel is divided into four sections which are labeled “Measuring Voltage,” “Test Functions,” “Telemeter Calibration,” and “Transmitters,” each with toggle switches, indicator lights, and a voltage meter near the top. Back edge of the bracket bears a NASA George C. Marshall Space Flight Center label which reads, “SII Measuring…Serial No. 004,Mfd. By GFE.” Two other labels are also present, one indicating the panel was modified on March 17, 1972. Affixed to the front of the panel is a small NASA-KSC inventory label and operational check label to the voltage meter. In fine condition.