We maintain ~22 Telepoles for daily use @Zion D&D. Agree that securing the detector tubes can reduce the ELD/EHD errors. In addition, check for poor solder points there. Another source of errors is the cord's modular connector getting bent too much. We invested in a telephone modular connector tool, so we can replace the connectors versus replacing the entire cord (that's not fun).
But our major expense was replacing the #@*!! aluminum poles when the clutches get cross-threaded; we eliminated those poles, and instead use a more rugged "long arm" pole with reasonable tighteners. This reduced our inst repair parts budget by $75k.
Otherwise, the Telepoles' edge is
no meter movement &
no rotating display. The only thing I'd like is a battery % readout, versus "beep hey batteries are dead" indicator.