【110kHz Ultrasonic】:The HumminGuru S-DUO stylus cleaner for record needles uses 110kHz of ultrasonic cleaning frequency to completely remove dust, grime, and hardened dirt off the stylus tip thoroughly. The impact on the sound quality is obvious. It is the First and Only record stylus cleaner that uses ultrasonic technology in the existing market. (It's important to note that frequencies lower than 20kHz are only considered as vibration and not true ultrasonic technology). | 【Contactless & Alcohol Free】: Cleaning the stylus in the ultrasonic bath with water requires zero physical contact and thus it is risk-free to the surface of the stylus. Unlike those record needle cleaners that utilize motor vibration and alcohol to clean the stylus with physical direct contact. S-DUO is an Alcohol Free Stylus Cleaner | 【HumminGuru Design】: The Ultrasonic Stylus Cleaner automatically stops after 20 seconds. Additionally, the digital turntable cartridge pressure gauge is cleverly incorporated into the device, which makes the setup process faster and more convenient for the user. With the feature of a bi-directional LCD display, the user can simply flip the device around and use the stylus gauge to measure the downforce right after Ultrasonic Stylus Cleaning. | 【Non-Magnetic Aluminum】: The accuracy of the stylus scale is 0.01G. The turntable stylus pressure gauge made of Non-Magnetic Aluminum would not affect the high performance of MC cartridges that rely on ion technology. | 【Ideal Gift & Portable】: S-Duo is compact, lightweight, and portable allowing users to easily carry around and requires a small space for storage and share with your audiophile friends. The turntable stylus cleaner and the cartridge tracking force scale (2-in-1) are compatible with different types of MM MC cartridges and such as Audio-Technica VM520EB, Denon DL-103, Denon DL-102, Ortofon 2M Red, etc. | 【Pro Version】: Since ultrasonic turntable stylus cleaner consumes a lot of battery power, the S-DUO Pro includes a premium installed rechargeable battery. The ultrasonic record stylus cleaner can be used to clean the record stylus over 100 times. The charging base also has a built-in storage for the accessories, so everything is in one place. For the record stylus scale in the Pro version, it adds a professional calibration function with a 5g mass for long-term use, while maintaining the record player stylus pressure gauge accuracy within 0.001G.