The ECS-240-30-30B-DU-TR from ECS Inc. International is a RF Quartz Crystal with Frequency 24 MHz, Frequency Stability ±100 ppm, Frequency Tolerance ±30 ppm, Load Capacitance 30 pF, Equivalent Series Resistance 30. Tags: Surface Mount. More details for ECS-240-30-30B-DU-TR can be seen below.