My kids jokingly call me cheap because I do not like to spend money. When analyzing a purchase, I equate it to how many hours I must work on a lousy jobsite to pay for my indulgence.
One of the most cost-effective sales/service tools I have is a combustion analyzer. It has paid for itself many times over because I use it for all types of HVAC equipment and not just boilers. It can generate thousands of dollars of extra revenue yearly and verify the safety of your customers’ systems. The combustion analyzer can read and display the efficiency and emissions of any fuel-fired appliance. The analyzer also will read and display the carbon monoxide levels.