for this model PH818 is top selling Pen type Ph meter in the market with high feedback from customs all over the world, This device is an intellectual precise measurement apparatus.It design and made with precise components and sensor,it have high sensitive and accuracy,stable to work with different temperature,small size for easy storage and hand carry.It can measure the PH value and measure solvent's temperature under test.PH meter widely applied in industrial,elextrical and agriculture,medicine,food industrial etc.It is very important that you read through this instruction before using this device to get the correct reading.

 Portable PH Water Quality Tester Acidometer for Aquarium Acidimeter water PH acidity meter PH818: