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    Chemist's (drug-stores) sell conductive gels of the kind doctors use for ECG. You may also wet the patches on the strap with salt water.
    – Carel
    Commented Jun 14, 2021 at 14:56
  • 3
    I never found tap water (or saliva) very effective, and often had to get a good sweat on to make reliable contact
    – Chris H
    Commented Jun 14, 2021 at 15:09
  • The use of oil-based skincare lotions & creams may also be an obstacle to good conductivity. The instructions with my strap recommend soaping the strap every five uses to remove oily residues from the skin. A GP friend of mine told me once that there are people whose skin gives unreliable ECG readings.
    – Carel
    Commented Jun 14, 2021 at 15:39