Features: Optoelectronic digital display: Use optoelectronic digital display, it intuitively and clearly displays the speed of the spiraled leaf, making it convenient for users to quickly obtain data. design: Handheld design, lightweight and easy to carry, allowing for speed testing, convenient and practical. Highly precised measurement: With highly precised speed measurement function, ensuring accuracy and reliability. One button operation: simple and easy to use, one button start measurement, convenient and fast operation. Multifunctional display: In addition to speed display, it can also display other related data, providing more comprehensive information support. Specifications: Material: ABS Size: about 90x50x16mm/3.54x1.96x0.62inch Working way: photo electricity Support indication up to: 99999 Display: LED Testing Fan Leaf: 2-9 Backlits color: blue Battery: 220mAh replaceable battery Package Includes: 1x Digital Optical Tachometer note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.