Able to be tracked, or worthy of being tracked.(adjective)
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Use "trackable" in a sentence
"Advertisers only pay when someone calls a trackable toll-free number included in the ad copy, as opposed to the pay-per-click service where advertisers pay whenever someone clicks on their ad."
"Set trackable goals / conversions for your site (emphasis on the word trackable)."
"Every industry wishes it had an accountable, trackable, meaningful means to refer potential customers like we do."