à¤Ã×èͧÇÑ´¡Ã´´èÒ§ EC900: Waterproof DO Kit 9-in-1 Meter DO/pH/EC/TDS à¤Ã×èͧÇÑ´¡Ã´´èÒ§ 9-in-1 Meter with Lab-Quality Performance Features: Measures Dissolved Oxygen concentration/saturation, pH, mV, Conductivity, TDS, Salinity, Resistivity and Temperature Automatic salinity compensation and manual barometric pressure compensation for DO measurements One button pH calibration (4, 7, and 10pH) Choice of 3 point pH calibration for better accuracy One point Conductivity calibration - automatically recognizes 8 calibration solutions from USA, Europe and China series Automatic Temperature Compensation (non-linear compensation for purified water <10µS/cm to improve measuring accuracy) Memory stores up to 400 readings with series number, measured value and temperature Large blue backlit dual LCD display Auto power off saves battery life with disable function Waterproof housing Complete with DO probe, pH/mV/Temp electrode, polymer Conductivity cell, pH and Conductivity calbration solutions, batteries and hard carrying case ** ËÑÇÇÑ´ ORP «×éÍà¾ÔèÁ Specifications Function Range Resolution Accuracy Dissolved Oxygen concentration 0 to 40.00mg/L 0.01mg/L ±1.5%FS Dissolved Oxygen saturation 0 to 200.0% 0.1% ±1.5%FS pH -2.00 to 19.99pH 0.01pH ±0.02pH mV -1999 to + 1999mV 1mV ±0.15mV Conductivity 0.00 to 199.9mS (0.00 to 19.99 uS/c) , (20.0 to 199.9 uS/cm) (200 to 1999 uS/cm) , (2.00 to 19.99 mS/cm) , (20.0 to 199.9 mS/cm) 0.01μS ±1.5%FS TDS 0 to 100g/L 0.0mg/L ±1.5%FS Salinity 0 to 100ppt 0.01ppt ±1.5%FS Resistivity 0 to 100MΩ . cm 0.1Ω ±1.5%FS Temperature (pH and mV) 32 to 212°F (0 to 100°C) 0.1° ±1°F/±0.5°C Temperature (other) 32 to 122°F (0 to 50°C) 0.1° ±1°F/±0.5°C Power Two AA Batteries Dimensions/Weight 4.7x2.6x1.2" (120x65x31mm)/6.3oz (180g) All in one AMTAST DO Meter EC Meter EC900 pH Meter Resistivity Meter Salt Meter TDS Meter Temperature Total Dissolved Solid à¤Ã×èͧÇÑ´ DO à¤Ã×èͧÇÑ´¡Ã´´èÒ§ à¤Ã×èͧÇÑ´¤ÇÒÁ¹Óä¿¿éÒ à¤Ã×èͧÇÑ´¤ÇÒÁà¤çÁ à¤Ã×èͧÇÑ´µÐ¡Í¹ à¤Ã×èͧÇÑ´ÁÇÅÊÒÃÃÇÁÅÐÅÒÂã¹¹éÓ à¤Ã×èͧÇÑ´ËÅÒ¤èÒã¹à¤Ã×èͧà´ÕÂÇ à¤Ã×èͧÇÑ´ÍÍ¡«Ôਹ à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ áºº¾¡¾Ò ã¹à¤Ã×èͧà´ÕÂÇ http://www.ponpe.com/ph-meter/%E0%B9%80%E0%B8%84%E0%B8%A3%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%87%E0%B8%A7%E0%B8%B1%E0%B8%94%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%99%E0%B8%B3%E0%B9%84%E0%B8%9F%E0%B8%9F%E0%B9%89%E0%B8%B2-ph-meters-%E0%B9%80%E0%B8%84%E0%B8%A3%E0%B8%B7%E0%B9%88%E0%B8%AD%E0%B8%87%E0%B8%A7%E0%B8%B1%E0%B8%94%E0%B8%81%E0%B8%A3%E0%B8%94%E0%B8%94%E0%B9%88%E0%B8%B2%E0%B8%87-ec900-waterproof-do-kit-9-in-1-meter-detail.html