The ECS-98.3-20-18-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 9.8304 MHz, Frequency Stability ±100 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 100. Tags: Surface Mount. More details for ECS-98.3-20-18-TR can be seen below.