BBlue LCD Digital TDS Meter Tester Water Quality 0-9999 ppm Purity Filter Water Solids Measure ReviewbP PP Blue LCD Digital TDS Meter Tester Water Quality 0-9999 ppm Purity Filter Water Solids Measure PConvenient, efficient and accuratePLCD digital display, easy to readPAuto shut-off after 10 mintues' non-usePLong battery lifePProvide a leather caseP