Alcohol Tester is a free Android app developed by Projects4FUN, falling under the category of Education & Reference. The app is designed to monitor the alcohol ADC value of MQ-3 sensor, which is sent via Bluetooth from Arduino, and warn the user if the ADC value is over the threshold value.

The app is simple and easy to use, with a clear interface that displays the ADC value in real-time. The app also allows users to set their own threshold value, and if the user's ADC value exceeds the set threshold, a warning message is displayed on the screen. The app is a useful tool for those who want to monitor their alcohol consumption, especially those who are driving or operating heavy machinery.

Overall, Alcohol Tester is a reliable and efficient app that serves its purpose well. It is a great tool for people who want to monitor their alcohol intake and avoid dangerous situations. However, it is important to note that the app should not be solely relied upon to determine sobriety and should always be used in conjunction with responsible decision-making.