Just weeks after its parent company gutted its own ad tech department, WanerMedia Ad Sales has selected a shortlist of alternative measurement partners. The media giant is following the competition as it looks to adopt audience-based currencies alongside its use of traditional panel-based measurement. Comscore, iSpot.TV and VideoAmp have all been recruited – three names that have become synonymous with Nielsen’s crumbling stature in the market. WarnerMedia will conduct ‘test and learn’ trials with its clients to determine how best to combine measurement tools from the three vendors. WarnerMedia says that it is now in the process of developing improved measurement solutions for its clients that make use of alternative currencies. The hope is that these will be better able…