Connect the power adapter to the back of the unit and then connect the other end of the adapter to an open wall socket. Once it is plugged in, press the "ON/OFF" button once to turn it on. After a moment, you will see the instrument display turn on and hear a loud beep to indicate the Hanna 211 is ready for use.
Place both the electrode tip and the temperature probe directly into the substance you want to measure. Place the probes into the substance so that they reach a depth of about one and half inches or four cm. Let the probes sit in the substance and gently stir the material for a few seconds.
Wait until you hear a beep and look at the display to see the results of the test. The large number that you see on the display will be the PH of the substance with a plug or minus sign in front of it to indicate where it falls on the scale. The second, smaller number on the screen will indicate the temperature of the substance.
Press the "MR" button and the current PH reading will be stored in the units memory. It will appear at the bottom of the display along with an "MR" label. With each successive test, you can press and hold down the "M" button to see the results of the last test you performed. Press the "ON/OFF" button when finished to turn off the unit.