The asthma monitoring device developer aims to raise $15m in a two-tranche series C-2 round that will be led by existing backer NGK Spark Plugs.

Spark plug producer NGK Spark Plugs has agreed to lead a $15m series C-2 round for US-based asthma monitoring system developer Spirosure, which aims to close the first tranche this month.

Founded in 2011 and formerly known as Spirometrix, Spirosure is working on a point-of-care breath analyser called Fenom Pro that can help clinicians assess an asthma sufferer more effectively. It comes with an app that helps patients track symptoms and reminds them when to medicate.

Solomon Ssenyange, Spirosure’s chairman…