It has a high-sensitivity glass probe , the full measurement range of the meter is 0-14ph Compared with other meters for water , there is only a range of 0°C-50°C our digital meter has a better range of 0°C-60°C ( 32°F-140°F Small size , portable , you can carry it with you wherever you go for Ideal for household and laboratory testing applications , including drinking water , swimming pool , pond , aquariums 4-in-1 tester , which can measure , ORP , , and Temp value with high at the same for time, Manufacturer: Watreketal