Jeff Liebermann wrote:
If all you want are the results, the common Kill-A-Watt power meter
has a PF measurement feature. $25-$40 everywhere.
http://www.p3international.com/products/special/P4400/P4400-CE.html
I have 4 of these (various models).

Thanks Jeff; that looks like a useful gadget. I may have to get one. But
I don't think it's applicable for my situtation which is 208V / 3-phase.

Actually there could be a way to use it for 3-phase. Assuming it measured
current on just the hot leg one could run one leg at a time through the
meter with the neutral side of the meter connected to the power line
neutral OR, even better, connecting it to the Y point of the power supply.
The meter would only be exposed to 120V. Basically, it would be imagining
this as 3 separate single phase loads. Then just sum the results.

But the meter is only good for 15A and my supply is pulling 18 and up.