Both work great. If I have the Fluke out testing something else - I will just use it , but if i open the unit up to test only the Cap(not sure when this would be) I pull out the Turbo Meter. Really it just comes down to which one I remembered to bring from the truck. I don't think I need the Turbo because the Fluke works great, I just got a great deal on it on e-bay, so I bought it.
Instead of learning the tricks of the trade, learn the trade.
I see that the Fluke 116 can measure .09 uF, which is how much capacitance at 120v and 60 Hz is needed to cause 4 mA reactive leakage current, which trips GFCIs.
Dunno' if you guys have to prove your motors are or are not tripping GFCIs.
I guess you should compute how many ranges of how many useful functions (capacitance, voltage, current, temp.) vs. the accuracy that you are getting, for the dollars you spend.
On top of that you should have in mind critical values for these four that are "must-haves" for the work that you do.
If a certain model is not selling well, or if one manuf. is trying to steal the market from another one, you can get a lot of functions for a good price-per-function.
I have a BK 391 from several years ago and I paid less than the current posted price. I would have liked to get a capacitance function but instead I measure voltage and current and I calculate capacitance (I wanted the 4-1/2 digits).
A clamp on ammeter probe for this meter is separate.
Factory calibration with a printout is 1/3rd of the current price. With inexpensive external shunts, voltage reference ICs, resistors, etc., you can do a lot of your own field calibration, or at least compare readings with meters that you know are working properly.