That is not depicting lock-out. It is the optimum PH range for the elements uptake. It is very accurate for Soil. The green area shifts to the left starting at 5.8 to 6.8 for peat based substrates; then 5.5 to 6.5 for all forms of hydroponics.
Good tools are the cat's meow!
I finally fixed my truck. I was at my wits end. Yesterday we put a new fuel pump and filter, Adjusted the air gap in the distributor, new plug wires, swapped back and forth the air box and igniter coil off a running truck and she was still bucking on the way home. So I thought to my self go old school. Back in the 60s before all of the diagnostic tools nowadays. If a car ran poorly you put in a new set of spark plugs. Even though it passed smog and all cylinders showed equal firing on the scope the number 4 plug was fouled. I have never had a bad plug not show on a scope and it is why it took so dam long to find. I trusted the scope. Anyhow I put a new set of plugs in and she purrs like a kitten and scoots down the road.
The number 4 plug is fouled with oil which means the valve guide needs a seal. I already scheduled the job.
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