The MIL-PRF-3098 QPL Crystals from MtronPTI is a RF Quartz Crystal with Frequency 1 to 61 MHz, Frequency Stability ±15 ppm, ±20 ppm, ±25 ppm, ±50 ppm, Frequency Tolerance ±15 ppm, ±20 ppm, ±25 ppm, ±50 ppm, Operating Temperature -40 to 85 Degree C. More details for MIL-PRF-3098 QPL Crystals can be seen below.