Gravity Sensor is an Android application developed by narusat, categorized under Education & Reference. It is a useful tool to measure the gravitational acceleration in real-time, which makes it perfect for science classes. The app displays the measured gravitational acceleration as a graph, and if the limit exceeds, it notifies the user with a sound. The app offers the flexibility to change the limit and sound according to user preferences. The data can also be exported in CSV format for further analysis.

Gravity Sensor is designed to keep the display on or run in the background during the measurement, ensuring that the user can view the graph without interruptions. The app also has a recording function to create a custom notifying sound, with a maximum length of 1 second. It is important to note that to hide the advertisement or use the recording function, users must select the "No Advertisement" option from the menu and watch a free ad video.

It is worth mentioning that Gravity Sensor uses the Apache 2.0 license library - AChartEngine, which ensures the app's reliability and accuracy. Overall, Gravity Sensor is a reliable application that provides accurate measurements of gravitational acceleration and is an excellent tool for science classes.