Thank you everyone. If I have to buy a new ato with closer sensors I will. It fluctuates between .25 to .27/.28 I’ve noticed. I’m just trying to find the easiest but accurate way. If I don’t need to touch then fine. It’s about 1”-1.5” from the water level sensor and the low sensor. My return chamber is the biggest I would say about 6” by 2.5/3”