ECHOMAX XPS-40 TRANSDUCER HIGH-FREQUENCY ULTRASONIC TRANSDUCER DESIGNED FOR A WIDE VARIETY OF LIQUID AND SOLID APPLICATIONS, FOR USE WITH APPROVED CONTROLLERS. INCLUDES INTEGRAL TEMPERATURE SENSOR. 1-1/2 UNIVERSAL THREAD COMPATIBLE WITH 1-1/2 NPT AND R 1-1/2 ((BSPT), EN 10226) MEASURING RANGE: MIN. 0.9M (2.95 FT), MAX 40M (131.23 FT)