 Shares of Socket Mobile Inc. skyrocketed 205 on very heavy volume toward a more than 13-year high in premarket trading Tuesday, to pace all premarket gainers, after the mobile data capture company unveiled its new DuraSled offering, which is an enterprise-grade barcode scanner for Apple Inc.s iPhone 12s. Trading volume swelled to 14.9 million shares, compared with the full-day average over the past 30 days of about 256,000 shares. 