The best replacement for tens unit is ems.

The best alternatives to tens unit are rated as following:
★★★★★  ems
★★★★★  muscle stimulator
★★★  nmes
★★★  electronic muscle stimulator
★★★  ultrasound
★★  ems unit
★★  marc pro
★  spinal cord stimulator
★  zapper
★  interferential unit
  bone stimulators
  bone stimulator
  interferential

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Speaking about tens unit, one probably shouldn't forget about muscle stimulator.

Other search terms related to tens unit and their ratings are:
★★★★★ muscle stimulator
★★ electrodes
★ 4 electrodes
★ back brace
ice
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Google Trends

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tens unit
ems
muscle stimulator