TEST METER APERA - SALT WITH CARRY CASE/SOLUTIONS APERA's unique BPB (Brush-resistant Platinum Black) probe ensures high accuracy and consistency in a wide-range salinity measurement (0 to 10 ppt / 0 to 10,000 ppm) EASY Auto Calibration with auto buffer recognition; Auto Temperature Compensation (ATC) ensures accuracy in variant temperatures (0-50.0°C) LARGE CLEAR LCD with DUAL Display of temperature/ppt, and REMINDERS of completed calibrations and stable readings COMPLETE KIT with READY-TO-USE calibration solutions, batteries, and a lanyard in a portable carrying case 1000 hours' continuous operation time powered by AAA batteries The Apera Instruments Salt20 Value Salinity Pocket Tester is simply the most reliable pocket salinity tester with the best value for all kinds of regular salinity testing, including tap water, agriculture, aquaculture, education, etc. Range: 0-10.0 ppt, Accuracy: ±1% F.S.