b'e lectronici ndicatorsw2900 w irelesse lectronici ndicators f eatures ands pecifications1" (25MM) Intuitive design and layout-easy to Starrett innovation brings a truly wireless indicator, keeping with the same featureslearn and useas the 2900 electronic indicators, these are now equipped to send data with the IP67 Protectionpush of a button, no cables needed. IP67 ratings across the entire range to help Positive, tactile-free button protect against coolant, water, chips, dirt and dust. True Absolute Sensor Technologyactivationminimizes the chance of data loss for exceptional reliability. CE compliant Origin set, zero setInch/Metric-.375" Stem-#4-48 UNF ThreadAuto Off after 20 minutes of ndIcatorsCat. No. EDP Range Resolution Accuracy nonuseW2900-3-1 73347 1" 0.0005" +/-.001"W2900-5-1 73349 1" 0.0005" +/-.001"Inch/millimeter conversionW2900-3M-25 73348 25mm 0.001mm +/-0.03mmTrue Absolute Sensor TechnologyW2900-5M-25 73378 25mm 0.001mm +/-0.03mmLug on Center backI Flat back included Rechargeable battery port Embedded radio allows to send data up to 30\' with no end nodes or cables38'