Display of current temperature and CO2 during a controlled experiment

In a kinetic experiment in the beginning it might be not relevant that the desired temperature / CO2 is reached, a couple of ° or % above/below might be fine as well. Currently the users have only a tick mark or an arrow ... but no information what actually is happening.

The tick marks / arrows could be accompanied by a mouse over which displays the current value. And it doesn't have to be too precise - so for temperature not all values should be displayed. Just select one that is probably most relevant, or use the calculation that is used to generate the numbers that are stored in the image.index.txt file.