The best replacement for zoll is lifepak.

The best alternatives to zoll are rated as following:
★★★★★  lifepak
★★★★  physio-control
★★  metrisch
★  physio control

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Speaking about zoll, one probably shouldn't forget about capnography.

Other search terms related to zoll and their ratings are:
★★★★★ capnography
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Google Trends

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zoll
lifepak
physio-control