Item Name: Tuning Fork Size: JU310/JU309/JU308/JU206 Frequency range:JU310: 3.579545MHz~4.00MHz JU309: 4.0MHz~30.00MHz JU308: 30.01MHz~70.00MHz JU206: 6.0MHz~48.0MHz This kind of tuning fork has slim compact size with good performance,economy in cost,and excellent anti-shock and environmental characteristics. It is widely used in electronic clocks, all kinds of telephones, and game systems.