This is a Varian XGS-600 Vacuum Gauge Controller with a MBA-100 vacuum gauge and convecTorr P-Type vacuum Gauge. Great Condition but unaware of working order. The unit powers on and shows no error codes. MBA: p/n: R1170301 s/n: LI1005L118 VARIAN: 100-240 Vac, 50/60 Hz   2A,    Single phase p/n XGS600H1M0C1 S/N: L10912L183