Aurabeat Technology, a Hong Kong Science and Technology Park start-up, has joined the crowded air purifying device market with what it claims to be the only product independently tested for its capability to eliminate the coronavirus causing Covid-19.The Pak Shek Kok-based company expects to close a US$2 million round of “seed” capital-raising soon, which would help bolster its war chest to develop international sales, chief executive Phil Yuen said in an interview with South China Morning Post…