| 摘要 |
PROBLEM TO BE SOLVED: To obtain an ion concentration measuring apparatus capable of surely protecting a measuring unit at the time of no measurement, automatically calibrating it, switching the measuring state or the non-measuring state by a one touch operation, and simply calibrating at need at the time of measurement. SOLUTION: A measuring unit holder 3 consisting a measuring unit 17 having an ion responder 7 and a reference electrode liquid junction unit 15 at the end is so provided in a cylindrical body 2 as to be axially movable and to be able to advance or retreat by a knocking mechanism 19 by a one touch operation, to liquid tightly contain a calibration liquid 22 between the body 2 and the holder 3, to allow the unit 17 to protrude out of the body 2 at the time of measuring, to contain the unit 17 in the body 2 at the time of no measurement, and to dip the unit 17 in the liquid 22 to be able to calibrate. |
