Additel ADT681A [ADT681A-02-DP] Digital Pressure Gauge, 0.02% FS Accuracy - Differential. The Additel ADT681A Digital Pressure Gauge is designed with providing a wide range of gauge and calibration options in mind. With Bluetooth technology and opt-in data logging included, the ADT681A provides durable, IP67 rated gauges built for the field as well as lab environments. The ADT681A is built with a stainless outer shell to protect the durable sensor within, to provide reliable reads in the long term. If working in an area with potentially explosive materials, see the ADT681AEx option. The ADT681A is designed to be easy to navigate for technicians, including a one-button press backlight for dimmer environments. Pressure reads can be displayed in larger font sizes for accurate reads from several meters away, ensuring maximum efficiency. The ADT681A was built with membrane buttons, which allows for easy cleaning. Paired with an extensive battery life, the ADT681A is fairly self-sufficient and requires minimal upkeep.