Omega Engineering's LD620 displacement transducer
LD620 Series of DC output displacement transducers are IP67-rated and have polymer guides with stainless steel carriers. A large bore-to-core clearance is maintained throughout the range to prevent misalignment. The transducers operate in wet and corrosive conditions and have a <0.2% linearity.
Omega Engineering; 203/359-1660; www.omega.com