You may not have the budget to acquire your own inventory at cost. Or, in terms of the kind of industrial or manufacturing business you are running, you may not need a powerful energy analyzer as a permanent feature of your maintenance inventory. It is a good idea that you do, but anyhow. You insist on it; this you do not need right now. But perhaps this is your first time. Perhaps this is your first risk management session after just a few months in business. Good that you have done so this early instead of waiting a year or so.
Nevertheless, a company that carries a large stock of rental equipment can also design and manufacture energy analyzers or power testing devices on your behalf. This is also an opportunity to focus on custom work in the hope that there is something unique about your industrial or manufacturing operations. Or perhaps you are doing industrial processing work. Now, it is imperative that your service orientator knows his inventory off by heart. Knowing what devices meet individual customer service requirements, it goes without saying, is essential.
Now, imagine having the benefit of a warehouse purported to be the largest supplier of power analyzers in the entire world. But there is a concern. Given the large market that such a company is required to service, what does this say about given quality and individual care and attention to detail? That being said, a company can also carry the reputation of being at least one of the best source suppliers in the world. There is only one way to see if the quality will be up to your requirements.
Do test it out. Rent the equipment first. That way you need not be saddled with costs down the line.