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ER1

Batteries are low and 
need replacing

ER2

Wrong or bad buffer
value (out of range) or 
the electrode is failing.
Check buffers or replace
electrode.
Over range signal from 
voltage on a solution, the 
electrode is not contacting 

OR

the solution, or the 
electrode is failing. Check 
solution or replace 
electrode. 

Waterproof pHTestr 1 and 2

Instruction Card

IMPORTANT: Please read 
completely before using the
Waterproof pHTestr 1 and 2. 
File this card for future reference.

Before you Begin

:

Remove the cap from the bottom 
of the Testr to expose the electrode
bulb and reference junction.  DO
NOT BE ALARMED if white 
crystals are present on the cap 
or electrode assembly.  This is 
normal and will dissolve during the
conditioning pre-soak.  For 
the conditioning pre-soak, pour a
small amount (about 1” deep) of
electrode storage solution, pH 4
buffer or tap water into a small cup
and soak the electrode for at least 30
minutes.  If the electrode dries out
between uses, re-condition by using
this soaking procedure. 

Calibration:
Calibration is necessary and should
be done regularly, typically every
day that the Testr is used.  Some
applications will need less frequent
calibrations but this can only be
determined by trial and error.
Calibrating Waterproof pHTestr 1:
1. Turn the Testr on by pressing the

ON/OFF button.  

2. Dip 1/2 to 1" of the electrode into

a pH 7.0 buffer for general pur-
pose use, into pH 4.0 if your tests
will be in acidic solutions, or into
a pH 10 buffer if your tests will be
in alkaline (or basic) solutions.  If
the tests will be in solutions closer
to pH 7.0 than pH 4.0 or 10.0,
even though acidic or basic, use
pH 7 buffer for calibration.  

3. Press the CAL button to enter the

Calibrate (CA) mode.  A ‘CA’ will
flash on the display and then a
pH value close to the pH buffer
value will flash repeatedly. 

4. After at least 30 seconds (about 30

flashes) press the HOLD/CON
button

to confirm the calibration.

The display will show ‘CON’ and

Waterproof

Waterproof

pHTestr 1

pHTestr 2

Range

–1.0 to 15.0 pH

Resolution 0.1 

pH

Accuracy

±0.2 pH

±0.1 pH

Calibration

At either pH 4.0; 

pH 4.0; 7.0

7.0; or 10.0

and 10.0

Automatic
Temperature

No

Yes

Compensation
Auto-Buffer

Yes

Recognition
Operating 

0 to 50ºC (32 to 122ºF)

Temperature  

ON/OFF, HOLD, CA (Calibrate) 

Functions

and CO (Confirm display); 
Auto-off after 8.5 min. after 
last operation
Three 1.5 V alkaline batteries 
(included). 24 hours continuous  

Power

use (approx. 720 tests per 
battery set) 
6.5”L x 1.5”Dia. (165 x 38mm) 

Dimensions

unit only; 8.5” x 2.4” x 2.5”
(216 x 61 x 64mm) boxed

Weight 

3.25oz./90g unit only; 
4.5oz./125g boxed

Specifications:

Warranty:

The waterproof pHTestr 1 and water-
proof pHTestr 2 are warranted against
defects in materials and workmanship
for a period of 6 months from the date of
purchase. If repair, adjustment or
replacement is necessary and has not
been the result of abuse or misuse within
the 6 month period, please return the
Testr—freight pre-paid—and correction
will be made without charge. Out of
warranty products will be repaired on a
charge basis.

Return of Items:

Authorization must be obtained from
your OAKTON Distributor before
returning items for any  reason. When
applying for authorization, please
include information regarding the reason
the item(s) are to be returned.
Note: We reserve the right to make
improvements in design, construction
and appearance of products without
notice. Prices are subject to change with-
out notice.

1

5

6

35624-02, -22 Printed in U.S.A. 1097-R3

1. Remove the Old Electrode

For older testrs with 2 slots only

2. Replace the Electrode

Small O-Ring (hidden)

Rotate collar away from you

Rubber 

Gripper

Band

Older testers 

may have only 

two slots. In this

case, break off the

two small tabs using

a needle-nose pliers.

Ribbed Collar

Large O-Ring

Large Tab

Small
Tab

Insert Electrode

Replacement

Electrode

3. Tighten the Ribbed Collar

Rubber Gripper Band

Rotate collar towards you

Self-Diagnostic Messages

806-31

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