Meter Toolbox is a free Android app developed by JK.Fantasy. It falls under the category of Utilities & Tools and offers a range of built-in meters including Sound, Light, Gradienter, Magnetic, and Compass.

The app's main display screen provides real-time readings of the minimum, maximum, average, and current values for each meter. This allows users to easily monitor their ambient environment. Additionally, there is a "Reset" button that can be used to reset all the values to zero.

Meter Toolbox also offers a "Pause" button which stops a specific meter, reducing power consumption when it is not needed. Users can also record data using the "Record" button and access previously recorded values through the "List" button.

It is important to note that the accuracy of the meters may vary depending on the device, particularly the light and magnetic meter. If users encounter unusually high values, the app recommends using a separate accurate meter for verification.

Overall, Meter Toolbox is a versatile utility app that provides users with a convenient way to monitor their ambient environment.