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pH/ORP Meter Keypad

The pH/ORP Meter has four tactile keys that are used to 

setup and operate this instrument.

 

PREPARING THE METER

1.  Install the electrode by removing the electrode collar, 

orienting the electrode at the 4-pin connector (the 

electrode is indexed to only fit in one position – rotate 

until the connectors slide together), and then reinstall 

collar.

2.  Remove the battery cover and install 2 new CR2032 

batteries (included in box). Inspect the rubber seal and 

reinstall the battery cover.

3.  It is recommended to condition the electrode prior 

to use. If you have a soaker bottle attached to the 

sensing end of the electrode and the soaking solu-

tion is visible in the bottle, the electrode is already 

conditioned. If not, soak the electrode in a pH 4 buffer 

solution or 4M KCl Solution for 30 minutes or more 

prior to use.

OPERATING THE METER
A. Power ON/OFF

To turn the pH/ORP Meter on, press the Power Key:

To turn the pH/ORP Meter off, press and hold the Power 

Key for 2 seconds:

B. Set-up Your Preferences

The pH/ORP Meter can be customized to your prefer-

ences in regard to the pH calibration buffer set that 

is auto-recognized, the time and date, and Celsius or 

Fahrenheit temperature display. When replacing batteries, 

these settings do need to be reset. You can also recall 

stored data or erase that data in setup mode.
To enter the setup mode, press Scroll/Setup Key for at 

least 2 seconds. Then use Scroll Key to toggle through 4 

set-up options:

1.  Recall Stored Data

2.  Auto-recognized Buffer Sets

3.  Date & Time

4.  Temperature display (ºC/ºF)

Entering setup mode – press the Scroll/Setup Key for at 

least 2 seconds:

   

The first setup option is recall stored data - refer to the 

Section G regarding Recalling Stored Data.

If you press the Scroll/Setup Key again, the next setup 

option is the auto recognized Buffer Sets option.

B1. Set Auto recognized Buffer Sets

The options for Buffer Sets are either:

 4.01/7.00/10.00

 – popular in the USA 

 

(designated as “7.00”)

Or

4.01/6.86/9.18

 – NIST, popular in Europe, Asia 

 

(designated as “6.86”)

NOTE: Because the ORP Measurement is a relative 

measurement, it does not have a calibration procedure.
To adjust the Buffer sets, press Store/Backlight Key once 

and then use the Scroll/Setup Key to adjust the value to 

either 7.00 or 6.86.

Press the Store/Backlight Key to select the Buffer Set and 

return to measurement mode.

B2. Set Date and Time

Within setup mode, scroll to the screen that only shows 

the date & time to adjust this data. Press the Store/Back-

light Key to adjust the time and date:

By pressing the Scroll/Setup Key, you will move through 

the minutes, hour, day, month, and year info. To adjust the 

data, use the Power/Lock Key to increase the value, or 

the Cal Key to decrease the value. Use the Store/Back

-

light Key to save the adjusted value and move to the next 

data point. When the Date & time are accurate, press the 

Store/Backlight Key to go back to measurement mode.

Adjustment:

or 

 to increase (+); 

or 

to decrease (-). Use the 

 to save the 

adjusted data.

B3. Set Temperature Display to °C or °F

The pH/ORP Meter displays the temperature below the 

main pH or mV display. The display can be adjusted to 

read in Celsius (°C) or in Fahrenheit (°F). 

In setup mode scroll to the temperature display option 

and press the Store/Backlight Key to adjust the tempera-

ture display. Use the scroll/Setup Key to toggle between 

°C or °F. Then use the Store/Backlight Key to save your 

settings and exit to measure mode:

C. Lock Data

If you want to lock the current reading on your display, 

press the Power/Lock Key quickly. You will see a small 

lock icon appear to the left of the pH or mV characters. 

This may be used to briefly hold the data in moving water 

or unstable samples. This does not store the data, it just 

locks it.

To unlock the display, and continue in measurement 

mode, press the Power/Lock Key again.

D. Toggle Between pH and ORP

To toggle between pH measurement mode and ORP 

measurement mode (mV) press the Scroll/Setup Key

E. LCD Backlight Control

The pH/ORP Meter has a backlight for viewing in low-light 

conditions. The backlight should be used sparingly to 

avoid decreasing the battery life.
Turn the backlight on and off by using the Store/Backlight 

Key. Press it quickly to turn it off or on:

F. Store Data

The pH/ORP Meter will store up to 25 data points. Each 

point will have a number, and a date & time stamp. When 

the storage is full, it will overwrite the oldest data.
You can store data while the pH/ORP Meter is in mea-

surement mode or in lock mode by pressing and holding 

the Store/Backlight key for at least 2 seconds. Pressing 

this key for less than 2 seconds will turn on the backlight 

instead of storing data.

G. Recall Stored Data

To recall the data you have stored in the pH/ORP Meter, 

you need to enter the Setup Mode and toggle to Stored 

Data option.

To enter Setup Mode, press the Scroll/Setup Key for 2 

seconds:

The first setup option is the Recall Stored Data option. It 

will have a number and an icon that shows a folder with 

the letter “R” on it. The number indicates how many data 

points are currently in memory.
To review the stored data, press the Store/Backlight Key 

quickly. 

          

Then you can use the Scroll/Setup Key to scroll through 

the stored data points. By holding the Scroll/Setup key, 

you will quickly advance through the stored data.
To exit the Recall Stored Data mode, quickly press the 

Store/Backlight Key and you will return to measurement 

mode.

      

When there are no stored data points during the Recall 

Stored Data mode the number on the display will be 00.

H. Clearing Stored Data

To erase all stored data points, go to the Recall Stored 

Data mode (as described in G) and then Press the Store/

Backlight Key for at least 2 seconds. The display will 

show CLEA and this will flash when you release the Key.

Press the Store/Backlight Key quickly and the CLEA will 

stop blinking and in about 2 seconds the stored data will 

be erased:

You can abort the data erase mode by pressing the 

Power/Lock Key after the display flashes CLEA. The pH/

ORP Meter will return to Recall Stored Data mode.

I. Calibrating the pH/ORP Meter

The pH/ORP Meter can be calibrated for pH Measure-

ment only. ORP is a relative measurement that does not 

require or allow calibration. On occasion, check the ORP 

reading with solutions of a known ORP value (e.g. Light’s 

Solution or Zobell’s Solution).

 

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