Spectra 360 is a Salt Free Hypoallergenic Electrode Gel with Very Good Conductive and Lubricating Qualities. Great for Insertables.  A tube of this goes a long way.

Non-gritty STAY-WET formula allows for prolonged use without re-application Product of choice for ECG, TENS, monitoring and pediatrics Non-irritating, hypoallergenic, bacteriostatic Salt-free, no sodium ion transfer Product of choice for conductive rubber / carbon electrodes Spectra 360 differs significantly from all other electrically conductive media…it works by wetting the skin, thereby reducing skin resistance