This can be useful, but the indicated speed is the theoretical maximum based on raw parameters extracted from the wireless card. All that is required is a completed connection between the computer and an access point. Actual transmission of user data may not be possible even though the indicated connection seems strong.

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I've found that my laptop's wireless capability is more potent than a typical phone or pad -- particularly the older phone/pads. If I walk the area with my laptop, it may be doing very well, but the customer's phone/pad struggles. I like to use my own phone to map the area. This will more realistically allow me to estimate the effectiveness of coverage for the customer.

At some point I involve a customer's unit as a reality check.

I have also observed multi-path issues where moving the client device a fraction of an inch will be the difference between poor performance and success. In one case I was contemplating blue tape registration marks on the kitchen counter for the customer's laptop. Rotating the laptop a few degrees resulted in large performance variations.

Always a risk is interference from a neighbor because this interference can vary by time of day or week and location within the customer's site.