“It raised alarm bells,” said Nick Lowell, founder and president of Lowell Instruments during an interview on Feb. 19. The cause wasn't pesticides; it was low oxygen concentrations at the ...

oxygen concentration of 82 per cent and 95 per cent normal at a pressure of 50-80 kPa Shwaas has audible alarm for low purity, low & high levels of pressure and flow rate of oxygen. The device ...