I believe sensor technology to be one of the better tools to come along in quite some time.
Can you cover every square yard of your course, of course not?
Can you measure moisture, salinity and temp in your greens, damn right you can.
In my situation I have very bad water; high salt, low calcium, leaving me with a very high Sodium Adsorption Rate, (SAR).
Usually it's not an issue as we get a lot of rain >45 inches annually. But, last year we were 21 inches below and so for this year we are 11 inches behind.
So, we have to flush our salts, combined with a lot of other tools we use like certain acids, wetting agents, fertilizers and cultural techniques. It's informative to sit and watch the moisture build up and them break through and see the salt numbers tumble. Now, could you grab moisture probes and EC meters and run around the course and check it out while it's happening? Yes, but usually it's in the middle of the night. With the sensors you just pull it up and see what happened, five minutes at a time. Compare that with your irrigation programming record and it's easy to stay on top of it at all times. Add in the notes you take whenever you apply a product or do something to the greens and you begin to build a recorded database that ties it all together. We already intuitively do that sort of thing, but the senosrs are one more bit of real information you get in real time. No guess work as the numbers do not lie. Want to know what the soil temps are before you apply a pre-emergent, yes you can run around with a thermometer, or you can look back over the last month and see the temp changes in the soil. Want to know how much a rainfall leached your salts vs an irrigation flush, it's all right there.
Does that mean you sit in the office glued to the monitor? Hell no, it's all recorded and available to you with a few mouse clicks.
I'm sure we heard the same thing when weather stations came out or computerized irrigation and so on. It's another tool that gives you the data to make decisions based on fact. That's a good thing. If anything I've learned its knowing what's going on in the ground is a bit like looking a few days into the future. There's a delay between underground levels and above ground changes. Sensors help me be a bit more proactive and I plan on learning a whole lot more about how to use them better.
Right now, there are two sensor dealers that I know of, AST and TORO. I think one of the major players with AST is a member at Merion so it makes sense that Matt Shaffer would be a leader in the sensor field.