Not unlike the Thermostat industry that has recently started to enter the modern age, The instrument manufactures we deal with aren't very good at creating solutions that fit the needs of the technician in the field. I think a big part of this problem is a lack of communication between the people who design tools and those who use them. sometimes it results in not taking the technology as far as it could go, other times tools are way more than we need. That's why I'm throwing an idea out there as an example of something simple and highly useable.
So many techs don't take the measurements because just hauling all the crap we could use to diagnose a system in and out of the house, setup, break down, taking readings....
The concept is for a dual temperature thermometer that is easy to carry, setup, read and store. No buttons to push to change the display, a magnet on the back for quick mounting, and a way to store the right kind of probes for taking accurate air temperature readings without them getting damaged.
Oh, hey, lets get a little crazy too. we'll add a central display that tells us the DeltaT too!
Check out the attached file and let me (and a manufacture) know if you would buy one. I know I would.
Keep in mind that this thread is about a great deal more than just the tool I'm suggesting. It's about getting the tools we need to do a better job in the field and do it quicker.