gold/silver/Si/SiO2/Chrome/SiO2/TiO2/Zn/Fe/W/Mo/Co/Pb/SiN and many other material coated, 1~50MHz, all kinds of diameters.
usual frequncy is 6MHz,9MHz and 10MHz, but we can supply many other such as 3MHz, 15MHz,20MHz, 30MHz
For auto lab, open QCM and so on.
used on many air quality monitor.