The ECS-192-18-30B-AGM-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 19.2 MHz, Frequency Stability ±30 ppm, Frequency Tolerance ±25 ppm, Load Capacitance 18 pF, Equivalent Series Resistance 50. Tags: Surface Mount. More details for ECS-192-18-30B-AGM-TR can be seen below.