MKS/ BROOKS/ GP 275534-EU 真空计9.9成新。质保三个月，无条件退货退款！275817 正常pin12间电阻19～22Ω，若读值840Ω左右意味着坏了，需要更换。Normal resistance can be checked between pins 1 and 2, the reading is 19～22 ohms.Resistance ～840 ohms means broken sensor, need to replace gauge.