Many companies keep prices low to attract the mass market. Others, like Daqri, opt to court a select audience willing to pay for special features. The Los Angeles-based startup is betting that industrial employers will spend substantial money on an unusual high-tech helmet designed to help blue-collar workers do their jobs. Daqri’s Smart Helmet looks like a space-age hard hat. It has a transparent visor and special lenses that serve as a heads-up display, along with an array of cameras and sensors that help users navigate and gather information about their environment. The company has been selling software that helps companies use augmented reality, the technique of superimposing information on real-world objects viewed on a display.