The Turtle Tough range of General Purpose pH & ORP Sensors have been designed for the most common application and installation types. These sensors take into account the most typical installation methods, such as immersion, submersion, twist lock and valve retractable (hot tap) styles. High Temperature and Dehydration resistant are also general qualities required across a broad range of applications. The chemical resistance properties of all sensors have been designed to perform well across a wide range of expected conditions. Don't for a second be fooled into thinking that general purpose means average performance. Designed to be good all-rounders many of these sensors are loaded with features. Our general purpose range features the toughest sensor we've ever made... the Turtle Tough Digital Extreme!