I need a tool that would be able to check the overload of the UPS as well as high input voltage, if there is any. Can you help?
In modern times UPS devices have their own application used for monitoring high voltage, overload and its status and it should usually be delivered with the product. In case you don't have this program from the company which developed the device, you can use UPS Monitoring Software by Spiceworks. Once the app is installed and connected to UPS, it will display all the relevant information in a nice way so that users understand what is happening. It has alarm and notifications of possible outbreaks and errors.