This is a high precision ABSOLUTE Digital Height Gauge that offers you the following benefits: 

• It has a high accuracy, high resolution ABSOLUTE linear encoder for position detection. 
• Types with and without pneumatic drive mechanism.
• Automatic running of prelearnt part programs.
• You can easily implement frequently used measurements, such as inside/outside diameter and pitch calculations, by icon-based commands that also support easy one-key operation.
• Extraordinary battery life -GO/±NG judgement is performed by setting the upper and lower tolerances.