Dr.meter pH Meter, Upgraded 0.01 Resolution High Accuracy PH Tester with Backlit Two-Color LCD Display and ATC, 0-14pH Measurement Range with Data Hold Function Digital pH Tester Pen-PH838

The glass probe is blown in shape at a high temperature above 1000 Celsius degree.

Covered with the glass-sensitive film with low resistance, it's quick and easy to respond with H+ in the solution, which greatly increases the sensitivity and accuracy up to 0.001.