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carrying case.Hold FunctionPower Saver ModeDigital ThermometerWater Purity Tester Digital TDS Meter Ideal For Commercial Use. Includes A Carrying Case With Belt Clip. Highly Efficient And Accurate Due To Its Advanced Microprocessor Technology. Hold Function: Saves Measurements For Convenient Reading And Recording. Auto-Off Function: The Meter Shuts Off Automatically After 10 Minutes Of Non-Use To Conserve Batteries. Measurement Range: 0-4990 Ppm. From 0-999 Ppm, The Resolution Is In Increments Of 1ppm. From 1000 To 4990 Ppm, The Resolution Is In Increments Of 10ppm. Built-In Digital Thermometer Display: Large And Easy-To-Read Lcd Screen. Our Meters Are Calibrated With A 342 Ppm Nacl Solution. Meters Can Be Recalibrated With A Mini-Screwdriver.