brand new and high quality Features: Range: 0~199.9ppt Resolution: 0.1ppt Accuracy: 2%F.S Battery: 4*1.5V(without batteries) Temperature Compensation: 0C~50C Operating Temperature: 0~50 Dimensions: 17050x28 mm Weight:51g OPERATING STEPS 1. Remove the protective cap. 2. Wash electrodes in distilled water, and dry it by filter paper. 3.Turn on by "ON-OFF" switch. 4. Put electrode into liquid which is to be test, and stir lightly. Wait until the digital is stable, read the final value. 5. After use, wash electrodes, put on protective cap. CALIBRATION 1.Immerse the meter in the distilled water.Activate it about some hours. 2.Immerse the meter in 35ppt calibration solution (at 25),and stir it gently. 3.Allow the reading to stabilize and turn the calibration trimmer with a small screwdriver until the display shows 35ppt. CAUTIONS 1. While testing please stir electrodes, and avoid the bubbles on it. Else it will affect the result. 2. If the error is too big or salinity value is not going back to 0, dip salinity electrode into ethyl alcohol and shake for 5-10 seconds to wash the electrode. Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1xSalinometer Halometer(without batteries)