@TheHarold That chart displays numbers as you hover over them as the dashboard chart can display all the things: Sensors Dosing pumps, notes.
You can also go to the chart for the sensor itself and it will show values along the Max, Min, and average reading for the time scale. You can select day, week, quarter, 6 months, or year and compare to another item. Like I can chart my CaRX pH and KHD readings on the same graph.