DTI-721
Comes with a blue vinyl protective cover that can be removed to replace the batteryDisplay shows Vacuum as (negative) or Pressure as (Positive)Hand held manometer with easy to read displayHas a 3 1/2" x 1 15/16" digital displayIncluded is a clear vinyl tube 15 inPowered by a 9 volt battery and indicates LOW BAT when it needs to be replacedReads in inches of water or vacuum in 40" of waterSelf-zeroing