Thermo Scientific PCTestr 35 Instruction Manual Download Page 2

Conductivity Calibration (Automatic):

  

For best results, calibrate with certified accurate conductivity calibration standards. 

Selection of multi-point calibration will allow up to three of the following values, while 
Single-point calibration will allow only one; choose 84 

μ

S, 1413 

μ

S, or 12.88 mS.

 

Conductivity Range  Automatic Calibration Value  Available with

0.0 – 200.0 

µ

S 84 

µ

S PCS 

only 

201 – 2000 

µ

S 1413 

µ

PC or PCS 

2.01 – 20.00 mS 

12.88 mS 

PC or PCS 

 

1.

 

Press 

 

to turn meter on and 

 to select conductivity mode as needed. 

2.

 

Rinse the sensor with clean water. Immerse the sensor into your standard and 

press 

. The primary display will show the un-calibrated value, while the 

secondary display display should search for and lock on the closest automatic 
calibration value.  

3.

 

Allow the primary display to stabilize, then press 

 to confirm the calibration 

value. The primary value will blink briefly before returning to measurement mode.  

4.

 

Repeat steps 2 & 3 with additional calibrations standards if desired.  

Conductivity, TDS, & Salinity Calibration (Manual):

 

For best results, calibrate with certified accurate calibration standards. 1 point per 
range. 

Conductivity (3-pt) 

TDS (3-pt) 

Salinity (1-pt) 

0.0 – 200.0 

µ

S* 

0.0 – 99.9 ppm* 

201 – 2000 

µ

100 – 999 ppm 

2.01 – 20.00 mS 

1.00 – 10 ppt 

1.00 – 10 ppt 

          *

Range only available with PCS Testr 35 

 

1.

 

Press 

 

to turn meter on and 

 to select conductivity, TDS, or salinity 

mode. 

2.

 

Rinse the sensor with clean water. Immerse the sensor into your standard and 

press 

. The primary display will show the un-calibrated value, while the 

secondary display will display the factory default calibration.   

3.

 

Press 

 or  

 to manually adjust the primary display to your calibration 

standard. 

4.

 

Press 

 to confirm the new adjusted value. The primary value will blink briefly 

before returning to measurement mode. 

  
5.

 

Repeat steps 2 & 3 with additional calibration standards if desired. 

 

Hold Function: 

For prolonged observation of a reading, press 

 during measurement mode to 

freeze the display. The “HOLD” indicator will display when the reading is held. To 

release the held value and resume live measurement, press 

.

 

Sensor Replacement:

  

Your instrument includes a replaceable sensor (Eutech PCSENSOR - 01X097108 / 

Oakton 35425-50). If the tip gets damaged or as the sensor wears over time, the 
entire sensor can easily be replaced. To remove the old sensor, simply twist off the 

ribbed collar and pull the sensor straight out. 
 

        

 

 

 

To install the new sensor, line up the tabs and 8 pins of the 
sensor to the instrument body. Twist ribbed collar back on to 

keep waterproof rating and secure sensor. The O-rings 
should create a watertight seal and provide some resistance 

when twisting. 

 

 

Battery Replacement:

  

Your Testr includes (4) 1.5V alkaline batteries. LR44 or A76 battery types are suitable 

and commonly available. Replace all (4) batteries together. 

Waiting too long to replace the batteries can lead to inaccurate 
readings and is the most common cause of problems. Twist and 

unscrew to remove the battery cover at the top of the Testr. Pull 
on the white ribbon to remove the batteries. Note the correct 

polarity of the instrument before installing. The flat side of the battery is +. Place new 
batteries on top of the white ribbon so they can be easily removed next time. Hand 

tighten the battery cover to keep waterproof rating. 

 
Storage:

  

The sensor does not require special storage. Rinse with clean water after use and 

cover the sensor with the included cap. Keep at room temperature away from extreme 
temperatures. The sensor can easily be re-hydrated by soaking if stored dry. 

 

Message 

Indicates

 

 

>75% battery life remaining 

 

50-75% battery life remaining 

 

25-50% battery life remaining 

 

No bars & blinking = replace batteries 

Err 

Calibration error, usually attempting to calibrate to a value which is 
out of range or under range.  

Unstable pH reading 

/ Slow response 

Broken or dirty sensor. Clean, rehydrate, and replace if necessary. 
Could also be due to low battery condition or sample with 
temperature that has not stabilized. 

“Ur” (Under range) 

or  

“Or” (Over range) 

Measured value is out of range. Most often caused by dry electrode 
that needs to be re-hydrated / soaked. Sensor may not be 
completely submersed or is not connected to Testr body properly. 

Meter not responsive 

If “Hold” on display, press Hold key to resume live measurement. 

Secondary display 

continually scrolls 

The automatic calibration standard is not within expected calibration 
range. Use fresh standard or an alternate calibration standard. 

Warranty:  

The waterproof Testrs are warranted to be free from manufacturing defects for 1 year 

and the electrode module is warranted for 6 months, unless otherwise stated. If repair, 
adjustment or replacement is necessary and has not been the result of abuse or 

misuse within the time period specified, please return the tester – freight prepaid – 
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 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 without notice.

 

 

 

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