1. Selection of popular models from online marketplaces easily accessible to people because there is no benefit of recommending a product that our readers cannot easily buy. Popularity is taken into consideration because it allows better assessment of the tool due to availability of healthy customer feedback that is not available for newly launched models.

2. Comparison of shortlisted models in their technical specifications, features, ergonomics, performance, manufacturer's support (especially in the form of warranty) and cost effectiveness. We weigh the shortlisted tools against each other on the referred factors to find where one tool beats the other not only in an overall competition but also to become suitable for a specific application.

3. Carrying out an in-depth survey of customer and user feedback of tools to identify problems and shortcomings of the tool as well as the unique advantages that separates the tool from the rest. This step allows us to gain insight into the performance of the tool in different hands and under different working conditions and applications - something that cannot be simulated in any test environment. It helps us determine which tool is fit for a homeowner but not a professional and which tool is fir for a HVAC technician but is an overkill for a DIYer.

4. Consultation with manufacturer's website, technical manuals as well as other review resources to find important aspects and pieces of information about competencies, merits and demerits of the tool not readily available elsewhere. Brands always tell all the features, specifications and advantages they have in their tool but they seldom highlight all that is missing. For that we have to do the digging to find cons of even the top tools we recommend.