At my home I have this timer and I am not sure how to use it. Model seems to be TM8IM-24. I have found a company that sells it but cannot find instructions.
Does anyone knows how to use it or where I can find instructions?
It looks like you pull the red tabs in or out to have the device turn on or off for a given 15 minute interval. I'm guessing the black arrow is pointing to the current time. The switch on the side is to manually turn it on or off (or perhaps permanently off or on the timer). You'll just need to test it to see if the tabs being in or out correspond to on vs off. And to know about the switch on the side, try turning it off and see if the timer moves after 30 minutes.
To adjust the current time, you can turn the dial clockwise, but not counter clockwise.