I was truthfully a little let down I thought I could set a range top end and a low end. But if you set it to 5.8 as soon as it hits 5.8 it goes down. You can tweak it by setting your pump cycle time as much as it takes to dispense a set amount which usually brings it to a value you desire.
I was hoping for at 6.1 it dispenses constantly until 5.6 is reached and to be able to customize that range.
You can build cheaper with an Arduino if you know how to use it.
What I usually do is set it at 5.6 and toggle monitor/control.
I’ll set it monitor after it hits 5.6 and check on it until it reaches 6.1 and switch to control so it drops to 5.6 and then switch back to monitor. Not so bad it takes a week with my res size to make that swing g and it prevents me from standing near the res and waiting and dropping more adjusters and letting it mix and dropping more.