If you are looking at VNA equipment, make certain you have more than one unit in your plans for the following reasons:
1. If a unit goes down you still can operate at 1/2 efficency. If you have only one & it goes down - big problem.
2. Rental units are unlikely to be available from your local distibutor.
3. No other piece of equipment will work in an aisle set up around a VNA type machine.
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