Whatever Temperature Source You Need To Measure, Autometers Mechanical Temperature Gauges Will Provide You A Highly Accurate, Bullet Proof Reliable Solution. The Bourdon Tube Meter Movement Used In This Gauge Is Engineered To Function In Even The Harshest Conditions And No Electrical Connection Is Needed For Operation. A 6" Capillary Tube And 1/2" Npt Mounting Nut Are Included.