I have a Fluke 233 and I have only used the wireless display in one application. I'm in a refinery with large outdoor process units. We mount our VFD's in substations and since the VFD enclosures are too small to terminate field wiring we wire all of the digital and analog points to a marshalling cabinet before going out into the process units to pushbuttons, etc. These marshalling cabinets are anywhere from 5-25 feet from the VFDs that are wired through them. When troubleshooting field controls I hang the meter from a magnet on the marshalling panel and put the leads on the point I want to measure. Then I have taken the display off and stuck it near the VFD so I can work on a computer that is plugged into the VFD at the same time I can see the voltage change when someone in the field presses buttons or flips switches.
There wouldn't be any issues with accuracy because a digital protocol is probably used between the base unit and display. I haven't gotten the display far enough from the base to lose the signal, but I've only used them up to 20 ft or so apart. It works as advertised in my experience.
I still have a pet peeve with Fluke that they don't offer the low impedance voltage function on very many meters. It's on the 289, 117, and T+ tester, maybe others I'm forgetting, but they don't make a standard industrial DMM like the 87-V with low impedance voltage. Yes, the 289 does everything except wash the supper dishes but there is a noticeable lag between when the physical quantity changes and when the display updates, worse than other autoranging digital meters. This is annoying when troubleshooting but I deal with it. I'm still waiting for the 1587 DMM/megger combo with a low impedance option - then I could finally carry one meter!
