
LITMUSTIK®III 
PHH-3X/PHH-3X-KIT 
Pocket pH Tester
The PHH-3X pocket-size pH tester combines pH electrode, temperature sensor and 
readout into a single, compact unit. The electrode module contains a signal amplifier 
and a temperature sensor to let you take temperature-compensated readings. The 
electrode module is easily replaced, thus extending the life of this handy pocket tester. 
The electrode module detaches for easy replacement or battery removal.
The unit can be immersed up to 4" without damage. The PHH-3X has two-point 
calibration for both temperature and pH scales.
BEFORE FIRST USE
You must condition the unit before its first use. To do this, remove the protective cap 
and immerse the electrode in tap water for 30 minutes to hydrate the electrode and 
dissolve any crystals formed. 
CAUTION: Never immerse the tester above the yellow plug-in electrode.
After conditioning the electrode, perform pH calibration (see the pH Calibration 
Section). Temperature is factory-calibrated; therefore, temperature calibration should 
not be necessary.
ON/OFF Switch
Screw Adjustment
pH/Temp Selection
Protective Cap
MADE IN
USA

PH CALIBRATION
pH calibration is required to maintain instrument accuracy. Calibration should 
be performed on a regular basis; however, frequency of calibration is application 
dependent.
1. Turn on power switch at the right side of the unit and set the range switch 
to the pH position. Remove end cap and place tester in a container of pH
7.0 buffer solution. Stir gently and wait a few seconds.
2. After the reading has stabilized, adjust (S) trimmer with a small screwdriver 
to a reading of 7.0.
3. Rinse the electrode with distilled or deonized water. Shake the unit with a 
gentle snap motion to remove excess water from the probe.
4. Place the tester in a container of pH 4 or 10 buffer solution and adjust (Z) 
trimmer for a reading of 4.0 or 10.0.
5. Rinse the electrode with distilled or deonized water. Shake the unit with a 
gentle snap motion to remove excess water from the probe.
6. Repeat above steps as required.
TEMPERATURE CALIBRATION
1. Remove the end cap and place tester in a container of ice water. Allow 8 
minutes for the reading to completely stabilize. Gently stir the ice water.
2. Set range switch to degrees F and adjust (Z) trimmer for a reading of 32.
3. Place the tester in a container of water at a known higher temperature 
within the meter’s specified range. Allow a minimum of 8 minutes for the 
reading to completely stabilize. Adjust (S) trimmer for a reading of the 
known temperature on the display.
4. Repeat above steps as required.
OPERATING PROCEDURE
After calibration, sample measurements can be performed.
1. Dip tester in solution up to 1 inch level. Under no circumstances
immerse above the top of the yellow electrode.
2. Stir gently and wait a few seconds.
3. When not in use, switch off the tester. To ensure optimum operation, 
electrode should be kept moist. If the soaker pad in bottom of protective 
cap is dry, pour pH 4.0 or 7.0 buffer solution into the cap to remoisten pad. 
Should the pad be missing, simply add pH 4.0 or 7.0 buffer to the cap and 
replace.
MAINTENANCE IS EASY!
Rinsing the electrode with distilled or deionized water between samples and 
after use will prevent cross contamination and help extend useful life. When 
using aggressive solutions, or solutions with heavy metals or proteins, take 
readings quickly and rinse electrode immediately afterwards with deionized 
water to remove any residue. This helps eliminate any possible contamination 
of the electrode. 

Maintaining the protective cap soaker pad by moistening with pH 4.0 or 7.0 
buffer solution will help maximize electrode life. When the electrode will no 
longer calibrate or pH reading stays at a fixed value, replace the electrode 
module. pH electrode life is typically 6 months to 1 year depending on the 
application.
REPLACING THE ELECTRODE MODULE 
To replace the electrode module:
1. Press the yellow tab on the back
of the unit above the pocket clip 
and gently off pull the electrode 
module off the electronic 
assembly.
2. Slide the new electrode module
onto the electronics assembly 
until the yellow tab locks into 
place.
Everytime the electrode module is 
replaced, you must perform pH 
calibration.
CHANGING BATTERIES
Remove the yellow plug-in electrode while pressing yellow lock above pocket 
clip. Replace old batteries with fresh ones, noting polarity as shown in the 
battery compartment. Note: No battery connector wires to break!
SPECIFICATIONS
pH TEMPERATURE
Range: 0.0 to 14.0 pH Range: 32 to 158°F (0 to 70°C)
Resolution: ±0.1 pH Resolution: ±1°C or F
Accuracy: ±0.1 pH ATC Accuracy: ±1°C + 1 digit
GENERAL REPLACEMENT PARTS
Display: 2 1/2 digit 0.5" high LCD PHH-3X-R: Electrode Module
Battery: Three 1.55 V (included) PH-BATT-3: 1.55 V Battery (3 req’d)
Battery Life: 200 hr continuous PHA-4: Buffer solution, pH 4.0
Dimensions: 6" H x 1.7" W x 0.9" D PHA-7: Buffer solution, pH 7.0
(162 x 43 x 23 mm) PHA-10: Buffer solution, pH 10.0
Weight: 4 oz (113 g)
ON/OFF
Switch
Pocket Clip
Protective Cap
Y ellow T ab
BACK SIDE OF pH TESTER

M1661/1106 11785ML-98 Rev B.
®
®
OMEGAnet® On-Line Service
www.omega.com
Internet e-mail
info@omega.com
Servicing North America:
USA:        One Omega Drive, P.O. Box 4047
ISO 9001 Certified      Stamford CT 06907-0047
         TEL: (203) 359-1660  
         FAX: (203) 359-7700 
         e-mail: info@omega.com
Canada:        976 Bergar 
         Laval (Quebec) H7L 5A1 
         TEL: (514) 856-6928  
         FAX: (514) 856-6886 
         e-mail: info@omega.ca
For immediate technical 
or application assistance:
USA and Canada:      Sales Service: 1-800-826-6342 / 
         1-800-TC-OMEGA
®
         Customer Service: 1-800-622-2378 / 
         1-800-622-BEST
®
         Engineering Service: 1-800-872-9436 / 
         1-800-USA-WHEN
®
Mexico and       TEL: (001) 203-359-7803 
Latin America:      FAX: (001) 203-359-7807 
         e-mail: espanol@omega.com
Servicing Europe:
Benelux:       TEL: +31 20 3472121   
         FAX: +31 20 6434643 
         Toll Free in Benelux: 0800 0993344 
         e-mail: sales@omegaeng.nl
Czech Republic:      
Frystatska 184, 733 01 Karviná
         TEL: +420 59 6311899 
         FAX: +420 59 6311114 
         e-mail: info@omegashop.cz
France:        TEL: +33 1 61 37 29 00 
         FAX: +33 1 30 57 54 27 
         Toll Free in France: 0800 466 342
e-mail: sales@omega.fr
Germany/Austria:      Daimlerstrasse 26, D-75392 Deckenpfronn, Germany 
         TEL: +49 7056 9398-0 
         FAX: +49 7056 9398-29 
         Toll Free in Germany: 0800 639 7678 
         e-mail: info@omega.de
United Kingdom:      One Omega Drive
ISO 9001 Certified      River Bend Technology Centre
         Northbank, Irlam Manchester M44 5BD United Kingdom  
         TEL: +44 161 777 6611 
         FAX: +44 161 777 6622 
         Toll Free in England: 0800 488 488 
         e-mail: sales@omega.co.uk
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to 
the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves 
the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
This device is marked with the international caution symbol. It is important to read the Setup Guide before installing or commissioning this device as the 
guide contains important information relating to safety and EMC.
WARRANTY
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA 
Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that 
OMEGA’s customers receive maximum coverage on each product. 
If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) 
number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at no 
charge. However, this WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of being damaged as a result of 
excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s 
control. Components which wear or which are damaged by misuse are not warranted. These include contact points, fuses, and triacs. 
In addition to our standard warranty period, OMEGA will extend the warranty period for one (1) additional year only if the warranty card enclosed with each 
instrument is returned to OMEGA.
OMEGA is glad to offer suggestions on the use of its various products. Nevertheless, OMEGA warrants only that the parts manufactured by it will be as 
specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR 
IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A 
PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive and the total 
liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed 
the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.
Every precaution for accuracy has been taken in the preparation of this manual; however, OMEGA neither assumes responsibility for any omissions or errors 
that may appear nor assumes liability for any damages that result from the use of the products in accordance with the information contained in the manual. 
SPECIAL CONDITIONS: Should this equipment be used in any nuclear installation or activity, purchaser will indemnify OMEGA and hold OMEGA harmless 
from any liability or damage whatsoever arising out of the use of the equipment in such a manner.
RETURN REQUEST/INQUIRIES
Direct all warranty and repair request/inquiries to the OMEGA Customer Service Department.  BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, 
PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID 
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence. 
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
OMEGA’s policy is to make running changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.
© Copyright 2006 OMEGA Engineering, Inc. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced 
to any electronic medium or machine-readable form, in whole or in part, without prior written consent of OMEGA Engineering, Inc.
TRADEMARK NOTICE: ®,omega.com®, and  are trademarks of OMEGA Engineering, Inc. 
PATENT NOTICE: US and International Patents pending or applied for.
FOR WARRANTY RETURNS, please have the following information available 
BEFORE contacting OMEGA:
1. P.O. number under which the product was PURCHASED,
2. Model and serial number of the product under warranty, and
3. Repair instructions and/or specific problems relative to the product.
FOR NON-W
ARRANTY REPAIRS, consult OMEGA for current repair
charges. Have the following information available BEFORE contacting 
OMEGA:
1. P.O. number to cover the COST of the repair,
2. Model and serial number of product, and
3. Repair instructions and/or specific problems relative to the product.