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PerpHecT electrodes are the highest quality and most accurate pH electrodes available. These electrodes are manufactured to tighter tolerances and offer even greater accuracy and precision than our standard electrodes. When combined with PerpHecT meters, the most precise pH measurements are possible. The PerpHecT meters have the patented LogR™ technology, allowing the user to make temperature compensated pH measurements without the need of a separate ATC probe. Recommended Use: General purpose, superior performance ideal for dirty, difficult samples such as soils, sludges, colloids, viscous materials and organics. All Orion PerpHecT® electrodes have a BNC Connector and 1 m cable. Cap diameter is 16 mm. PerpHecT LogR^TM temperature measurement and compensation meter specifications are based on the use of Orion PerpHecT and PerpHecT ROSS^TM brand electrodes. Use of other brand electrodes may impact performance. (1) using Orion PerpHecT digital LogR Meters, 20°C calibration window (see instruction manual).