Ruler: measuring the length with the phone without the help of tools such as tape measure.
Decibel test: one-click detection of noise decibels.
You can also check the weather, temperature, etc. and prepare in advance.

Subscription.
1、Users can use the ruler measurement function, decibel test function and weather and temperature query for unlimited times only after they have passed the paid subscription, with a refreshing and ad-free interface.
2、The subscription fee will be deducted from the iTunes account when the user confirms the purchase, free trial for three days, renewable automatically, renewal fee $29.99/year.
3. users can turn off auto-renewal 24 hours before the end of the current subscription, otherwise the subscription will be automatically renewed.
4. the Apple ID of the automatically renewed subscription will be automatically deducted from the iTunes account 24 hours before the expiration of each billing cycle and the corresponding validity period will be extended.
5. Users manage the subscription service, i.e., they can go to their user accounts to set off automatic subscriptions after purchase.

User Agreement.
https://vciacsoym7.feishu.cn/docx/IIUWdn075ojg6YxyGxDczKxDnie
Privacy Policy.
https://vciacsoym7.feishu.cn/docx/TJxBdJULPoqqGExdFzncehOwnIh