On Fri, 5 May 2017 06:57:01 -0700, Taxed and Spent
wrote:

Contractor wants to monitor commercial tenant's current load throughout
the day for a month or two to see max load, and thus see how much of the
1000 amp panel capacity is left for a future second tenant.

I see several Fluke meters that costs a fortune, such as:

http://www.fluke.com/fluke/inen/powe....htm?PID=77038

Any other suggestions?

You can use a clamp on the phases when you think you are close to peak
load or you can just look at the accumulated usage from the PoCo meter
but a logger is the only way to be sure you see peak loads.