Handheld manometer with digital readout measures positive, negative or differential pressures. Select from up to nine of the most widely used English or Metric pressure units. Units will store up to 20 readings in memory. Has both audible and visual overpressure alarms. Pressure connections are barbed for 1/8" or 3/16" I.D. tubing. Selectable Pressure Units, ¬±0.5% Accuracy, FM Approved Intrinsically Safe for Hazardous Locations, Class 1, Div. 1, Group A, B, C, D, T4. Complete with instructions, wrist strap, and 9 volt battery.