High precision measurement - The device uses rail clamping so the path after setup is the same every time. When the guide rail is aligned parallel to the test model, measurement error and fluctuation are minimized and dynamic error is small. Four sided vent for stability - A four sided air outlet design reduces the influence of airflow on measurements, improving stability and accuracy of readings. Robust power management - The lithium battery provides overcharge and over-discharge protection, short circuit protection, and includes built-in intelligent shut-off and low battery auto shutdown for safer, longer operation. Multifunctional data recording - Not only measures speed but also kinetic energy. It can record up to 40 speed sets and 40 kinetic energy sets simultaneously for easy comparison and traceability. Use scenarios - In a laboratory or workshop, test speed and energy of miniature or RC vehicles to compare design variants. - In production quality control, verify speed and energy specifications and maintain test records for each unit. - In research and development, build performance datasets across multiple runs to analyze how design changes affect speed and energy. This description emphasizes function, stability, safety, and data capacity while staying consistent with the original product’s specifications and capabilities.