The ECS-120-9-42-CKM-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 12 MHz, Frequency Stability ±10 ppm, Frequency Tolerance ±10 ppm, Load Capacitance 9 pF, Equivalent Series Resistance 80. Tags: Surface Mount. More details for ECS-120-9-42-CKM-TR can be seen below.