Quartz in a hermetic, high-profile metal housing HCJ-30 maximum power 1 m Frequency stability greater than/equal to 100 ppm for temperatures 0 to +50 degrees Celsius frequency stability 30/50 ppm for temperatures -10 to +60 degrees Celsius frequency stability 10 ppm for temperatures - 20 to +70 degrees Cmaximum consumption - 2 ppm / first year, 1 ppm / next year