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NeuLog logger sensor measures light intensity, and can be used to monitor daily light levels in ecological systems, chemical reactions that emit light, light intensity from varying distances and mediums, and photosynthesis for further study. The logger sensor measures illumination in low light conditions, such as in a classroom, and in medium and high light intensity environments, such as daylight, for multiple readings. The logger sensor’s detectors record both slow and fast light changes, from varying light levels on a sunny day (slow) to changes produced by a light bulb connected to an AC supply (fast). The logger sensor has an experiment duration of 1.0 second to 31.0 days, and 12.0-bit analog-to-digital converter (ADC) resolution for reading a range of values. The light logger sensor can be used for physics, chemistry, biology, and environmental experiments, and is suitable for grade 3 and higher, or ages 10 to 21. The logger sensor consists of a data logger, flash memory, and a sensor for fully self-contained data gathering, and is plug-and-play for immediate readings as soon as it is connected. The logger sensor sends data in digital format to a PC, Mac, tablet, smart phone, or other viewer device, and provides multiple connection options, including USB and wireless. The logger sensor’s browser-based software adjusts ranges and gains, and provides applications for presenting data, including online and offline modes, tables, graphs, data analysis, double-axis set up, statistic operations, and mathematical operations. The logger sensor is encased in durable plastic, and has an LED indicator to track experiment status, with push buttons for calibration and start/stop experiments in offline mode for ease of operation. To take an assortment of readings during a single experiment, the logger sensor can be attached to another sensor; one to 10 logger sensors can be used per experiment (sensors sold individually). For efficiency, the logger sensor can store