1.Measures photon flux in the 400–700 nm wavelength range, which has a direct proportional relationship with plant photosynthesis rate, making it suitable for evaluating light conditions for plant growth and cultivation. 2.Equipped with MEM record function that displays the most recent four PAR readings, allowing quick comparison between current values and historical data for easier analysis. 3.Built-in storage for up to 100 data records enables convenient data comparison and review without the need for manual note-taking or external recording. 4.Uses a high-precision core photosensitive sensor to deliver accurate light measurements with fast response, ensuring reliable PAR data in real-time testing environments. 5.Supports factory reset through the MODE key to restore default and clear all stored records when zero calibration is incorrect or a full data reset is required.