Myron L 6Psi and 4P - Manual (Page 12)

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b. RES Key
A press of displays resistivity with units on the right. On the left
is shown solution type selected for resistivity (ref. Solution Selection, pg.
11). The range of display of resistivity is limited to between 10 kilohms
(KΩ) and 30 megohms (MΩ). A solution outside that range will only show
[- - - -] in the display.
c. TDS Key
A press of displays Total Dissolved Solids with units on the right.
This is a display of the concentration of material calculated from
compensated conductivity using the characteristics of a known material.
On the left is shown solution type selected for TDS (ref. Solution
Selection, pg. 11).
3. pH and ORP Keys (6Psi)
Measurements are made on solution held in the pH/ORP sensor well
(ref. pH and ORP, pg. 43). The protective cap is removed and the sensor
well is filled and rinsed with the sample enough times to completely
replace the storage solution.
After use, the pH/ORP sensor well must be refilled with Myron L Storage
Solution, and the protective cap reinstalled securely (ref. Maintenance
of the pH/ORP Sensor, pg. 9 and Cleaning Sensors, 2. pH/ORP, pg. 32).
a. pH Key (6Psi)
A press of displays pH readings. No units are displayed on the
right.
b. ORP Key (6Psi)
A press of displays Oxidation-Reduction Potential/REDOX
reading in millivolts; “mV” is displayed.
NOTE: See New ORP ppm Free Chlorine Feature, pg. 48, to change
units to ppm free chlorine.
4. CAL/MCLR Key
A press of allows you to enter the calibration mode while
measuring conductivity, TDS or pH. Once in CAL mode, a press of this
key accepts the new value. If no more calibration options follow, the
instrument returns to measuring (ref. Leaving Calibration, pg. 14).
If is held down for about 3 seconds, “CAL” mode is not entered,
but “SEL” appears to allow Solution Selection (ref. pg. 11) with the Up or
Down keys. As in calibration, the CAL key is now an “accept” key.
While reviewing stored records, the MCLR side of the key is active to
allow clearing records (ref. Clearing a Record/Memory Clear, pg. 21).