Utility meter billing with Odoo

Hi, new to Odoo.

I'm working on making Odoo work for a tenancy company. Which includes issuing invoices every month based on flat size, metered utilities, etc.

I'm trying to figure out how to include utility meters as a concept in Odoo. So that the invoice automatically calculates the difference between the old and new reading, takes the correct tariff (water, heating, electricity) , assigns the correct units (kWh, m3, etc). And displays the previous and latest reading a the bottom of the invoice.

Has anyone else come across anything like this? It is unlikely that I'll be doing the calculations by hand as there are too many invoices and chances of mistakes. I've got DIY spreadsheet that do all this and way more already, but want a platform someone else could use :)