Detailed Description  1).fundamental and 3-overtone are all available; 2).the frequency tolerance is ±10PPM/20PPM/30PPM; 3).the aging rate is ±5PPM; 4).the oprating temperature is -20oC~+70oC or -40oC~+85oC; 5).the load capacitance is 8PF~32PF or series; 6).we can make sure the quality and delivery date; 7).we will give you our best price and service.