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The JB Industries Wireless Micron Gauge, No. DV-40S, allows technicians to measure vacuum readings when evacuating an A/C system. The DV-40S offers data logging capabilities, programmable alarms and wireless connection for IOS and Android smart devices through Bluetooth 4.0 technology with the free JB app. The easy-to-grip form is made to hold up to wear and tear, and the water-resistant design offers peace of mind when working under less-than-ideal conditions, according to the company. The DV-40S app also allows users to choose from light or dark themes for greater visibility.