LaMotte pH PLUS Direct Meter - Manual (Page 11)

3.2 Selection of pH Buffer Standards
You must set the meter to accept either USA, NIST (nSt) or Low Ionic (Pb)
pH buffer standard values before calibration. The factory default is USA
standard. If you wish to abort this operation press the
CAL key at any sequence
and the meter reverts to pH measurement mode.
1. Press and hold the
MODE key. Switch on the meter using ON key. The
display shows “
bUF” blinking.
2. Press the
ENTER key to get into the buffer selection mode. Use the
MODE key to toggle between USA, NIST or Pb standards as shown.
3. Press the
ENTER key to confirm the buffer standards to be used. The
display then reverts to pH measurement mode.
3.2.1 Resetting the User Calibrated Values
Note: only the temperature offset (if set) will not be erased.
1. Press and hold the
CAL key while switching on the meter using the ON
key. The LCD shows “
rSt” blinking.
2. Press the
MODE key to abort this operation if you do not wish to reset
3. Press the
ENTER key to confirm. The meter automatically clears all stored
pH/Ion calibration or mV offset values and reverts to measurement mode.
11