WHZWith Backlight Or Not:YesDisplay Type:DigitalDIY Supplies:ElectricalScope of application:Aquarium swim pool waterFeatures:Automatic shutdown Backlight Display Online monitoring Range: pH 0.00 ~ 14.00TEMP: -50°C ~ 70°C (-58°F ~ 158°F)Resolution: pH 0.01TEMP: 0.1°C (0.2°F)Accuracy: pH ± 0.1TEMP: ±1.0°C (±2.0°F)Temperature Compensation: 0°C ~ 50°C (32°F ~ 122°F)Environmental temperature: 0°C ~ 50°C (32°F~ 122°C) Power supply: DC 6V (Power Adapter Usable)Battery: 4×1.5V AG-13 Button Cell Batteries (NOT Included)Color: YellowMaterial: ABSOPERATION:Remove the protective cap,put the ph electrode BNC connector into electrode soket .Press the "ON/OFF" to switch power .Remove the protective cap ,clean the PH electrode with distilled water ,and dry by filter paper .Dip into the testing liquid ,and shake it for a while .Then wait until the value become stable .The final value will be the ph result .After use ,switch off it ,Use the distilled water clean the electro de and replace the protective cap .(Note:The screen shows PH(first line ),Temperature .PH CALIBRATION: 1.Immerse the electrode in ph 6.86(under the temperature of 25°C)standard the buffer solution of phosphate ,and gently shake the electrode .2.Rugulate the trimmer with a screwriver until the buffer solution value corresponding to the measurement temperature is obtained .3.Immerse the electrode in ph 4.01 or PH 9.18 the standard buffer solution of borax.4.After about one minute ,until the buffer solution value corresponding to the measurement temperature is botained.