This lightweight and portable diagnostic tool is built to withstand daily use, delivering reliability and longevity for both professional and applications. Target users: watch professionals, enthusiasts, and electronic device technicians who frequently measure battery condition across small electronics. Practical applications: use this versatile tool for watch maintenance to ensure timely battery replacement; test the health of batteries in headphones and remote controls to guarantee performance. Features and readability: userfriendly interface with a contrast LCD screen, easy to operate and read even in low light conditions, suitable for various electronic devices. Durability and portability: lightweight, portable design built for reliable use in daily workflows. Compatibility and performance: versatile with a range of small electronic devices, emphasizing dependable function, broad compatibility, compact size, and strong performance. Use scenarios Onthebench watch service: quickly assess battery condition to decide whether a replacement is needed during maintenance. Headphones and remotes maintenance: verify battery health to ensure operation after service. Field or home use: perform quick battery checks across various small electronics to confirm performance before reassembly or use.