Measure Toolbox is a utility app that provides a compass, bubble level, ruler, protractor, sound meter, flashlight, magnifier, mirror, light meter, magnetic field detector and barometer.

We do not collect any personally identifiable information, nor do we collect device identifiers, location, contacts or usage data. The app has no account system; all features work without signing in.

The app does not request the internet permission and is technically unable to send any data to a server.

Camera: used only by the Magnifier and Mirror tools to show a live camera preview on screen. The app does not take photos or record video, and the image is never saved or sent anywhere.

Microphone: used only by the Sound Meter to calculate the loudness of ambient sound (a decibel value) in real time. The app does not record audio; the audio data is discarded immediately after the calculation and is never saved or sent anywhere.

The Flashlight switches the camera flash through a system interface. It does not need the camera permission and does not open the camera.

Each permission is requested only when you open the tool that needs it. You can deny it or revoke it at any time in system settings; the other tools keep working.

The compass, level, light meter, magnetic field detector and barometer read values from your device sensors (accelerometer, magnetometer, light and pressure sensors) to show measurements on screen.

These values are used locally in real time. They are not stored as a history and are not uploaded. The app does not access your location; the altitude shown by the barometer is estimated from air pressure.

The app stores only the calibration values of the ruler and level in its private storage. Other apps cannot access them.

You can delete all data at any time by clearing the app data in system settings or by uninstalling the app.

If you have enabled backup on your device, Android may back up these values to your own Google account. We have no access to those backups.

The app does not include any advertising, analytics or crash-reporting SDKs.

The app is distributed through Google Play. Depending on your device settings, Google may collect diagnostic information such as installs and crashes, which is governed by the Google Privacy Policy (https://policies.google.com/privacy).

The app is not directed at children under 13, and it does not collect personal information from any user, including children.

We may update this policy when the app, the law or our operations change. The updated policy will be published on this page with a new effective date. If a new version materially changes how data is handled, we will notify you prominently in the app.

If you have any questions or requests about this policy or your privacy, please contact us at [email protected].

测量工具箱是一款工具应用，提供指南针、水平仪、尺子、量角器、分贝计、手电筒、放大镜、镜子、照度计、磁场探测和气压计等功能。

我们不收集任何能够识别您个人身份的信息，也不收集设备标识符、位置、通讯录、使用行为等数据。本应用没有账号体系，您无需注册或登录即可使用全部功能。

本应用未申请网络权限，技术上无法将任何数据发送到服务器。

相机权限：仅用于「放大镜」和「镜子」两个工具，在屏幕上实时显示相机画面。应用不拍照、不录像，画面不会被保存或发送到任何地方。

麦克风权限：仅用于「分贝计」，实时计算环境声音的音量大小（分贝值）。应用不录音，声音数据在计算后立即丢弃，不会被保存或发送到任何地方。

手电筒通过系统接口开关闪光灯，不需要相机权限，也不会打开相机画面。

两项权限都只在您打开对应工具时才会请求。您可以拒绝，或随时在系统设置中关闭，其他工具不受影响。

指南针、水平仪、照度计、磁场探测和气压计会读取设备的加速度、磁场、光线、气压等传感器数值，用于在屏幕上显示测量结果。

这些数值只在设备本地实时使用，不会被保存成记录，也不会被上传。本应用不获取您的位置信息，气压计显示的海拔是根据气压估算的。

应用只在自身的私有存储空间中保存尺子和水平仪的校准值，其他应用无法访问。

您可以随时在系统设置中清除应用数据，或卸载应用以删除全部数据。

如果您在系统中开启了备份功能，Android 系统可能会将这些校准值备份到您自己的 Google 账号，我们无法访问这些备份数据。

本应用不集成任何广告、统计分析或崩溃上报等第三方 SDK。

本应用通过 Google Play 分发。Google 可能会根据您的设备设置收集应用安装、崩溃等诊断信息，相关处理适用 Google 隐私权政策（https://policies.google.com/privacy）。

本应用不面向 13 周岁以下儿童，也不会收集任何用户（包括儿童）的个人信息。

我们可能会根据产品功能、法律法规或运营需要更新本隐私政策。更新后，我们会在本页面发布新的隐私政策并更新生效日期。如新版本涉及数据处理方式的重大变化，我们会在应用内以显著方式提示。

如果您对本隐私政策或个人信息保护有任何疑问、意见或请求，可以通过邮箱 [email protected] 联系我们。