"They are a lot less hassle than completely rolling your own"

I do plan to use a standard one from Analog devices and I am aware that there are other ones from Maxim , LT etc with a lesser output like 1.2V. I was planning to check the precision at maximum span - hence chose 10V. So I dont think I am rolling my own ?

The 9v batteries are Alkaline types from Duracell and current level that I am talking about at the measuring end is less than 0.5 ma. The temperature range is from 30 to 34 Deg C, when the actual recordings will be made.

Raghu