The ECS-59.9-20-5PX-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 5.9904 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 20 pF, Equivalent Series Resistance 80. Tags: Surface Mount. More details for ECS-59.9-20-5PX-TR can be seen below.