Metek Tono-Pen AVIA User manual

Tono-Pen AVIA®
Tonometer
User’s Guide

©2017 AMETEK, Inc.
Reichert, Reichert Technologies, Tono-Pen, Tono-Pen AVIA, Tono-Pen AVIA POWERCEL
and Ocu-Film are registered trademarks of Reichert, Inc.
AMETEK is a registered trademark of AMETEK, Inc.
All other trademarks are property of their respective owners.
The information contained in this document was accurate at time of publication.
Specifications subject to change without notice. Reichert, Inc. reserves the right to make
changes in the product described in this manual without notice and without incorporating
those changes in any products already sold.
ISO 9001/13485 Certified – Reichert products are designed and manufactured under
quality processes meeting ISO 9001/13485 requirements.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted
in any form or by any means, electronic, mechanical, recording, or otherwise, without the
prior written permission of Reichert, Inc.
Caution: Federal law restricts this device to sale by or on the order of a
licensed physician. Rx only.
The Tono-Pen AVIA Tonometer Help Line
Should you need immediate help with a technical question or guid-
ance through the appropriate procedure, just call the Help Line at
888-849-8955
Note: When contacting our Technical Service Group at Reichert,
please have the appropriate product number, product serial
number, date of purchase, and nature of inquiry available.
Product Number: _______________________________
Serial Number: _________________________________
Date of Purchase: ______________________________

68E3892 Rev. J 3
Table of Contents
Warnings and Cautions ............................................... 4
Symbols........................................................................ 8
Introduction................................................................... 9
Indications for Use ................................................ 9
Contraindications .................................................. 9
Device Description .............................................. 10
Features.............................................................. 10
Parts Identication................................................11
Available Accessories ..........................................11
Instructions for Use .................................................... 12
Tono-Pen AVIA Tonometer Modes ...................... 12
Tono-Pen AVIA Tonometer Verication................ 13
Tono-Pen AVIA Tonometer Tones........................ 15
Battery Installation and Replacement ................. 16
Liquid Crystal Display - User Interface................ 17
Tono-Pen AVIA Tonometer Preparation............... 19
Verication Mode................................................. 20
Performing IOP Measurements........................... 21
Applanation ......................................................... 22
Interpreting the IOP Measurement...................... 23
Cleaning & Maintenance ............................................ 24
Cleaning Instructions........................................... 24
Battery................................................................. 25
Storage................................................................ 25
Disposal .............................................................. 25
Troubleshooting.......................................................... 26
Specications ............................................................. 27
Guidance & Manufacturer’s Declaration .................... 28
Device Regulatory Classication................................ 30
Warranty..................................................................... 31

4 68E3892 Rev. J
Warnings and Cautions
Reichert Technologies (Reichert) is not responsible for the safety and reli-
ability of this instrument when:
• Assembly, disassembly, repair or modication is made by unauthor-
ized dealers or persons.
• Instrument is not used in accordance with its User’s Guide.
WARNING: AN INSTRUCTION THAT DRAWS ATTENTION TO RISK OF
INJURY OR DEATH.
WARNING: UNITED STATES FEDERAL LAW AND EUROPEAN REGULATIONS
REQUIRE THAT THIS DEVICE BE PURCHASED ONLY BY A PHYSICIAN OR A
PERSON ACTING ON BEHALF OF A PHYSICIAN.
WARNING: DO NOT REPAIR OR SERVICE THIS INSTRUMENT WITHOUT AU-
THORIZATION FROM THE MANUFACTURER. ANY REPAIR OR SERVICE TO
THIS INSTRUMENT MUST BE PERFORMED BY EXPERIENCED PERSONNEL
OR DEALERS WHO ARE TRAINED BY REICHERT OR SERIOUS INJURY TO
THE OPERATOR OR PATIENT MAY OCCUR.
WARNING: THIS INSTRUMENT SHOULD BE USED IN STRICT ACCORDANCE
WITH THE INSTRUCTIONS OUTLINED IN THIS USER’S GUIDE. THE SAFETY
OF THE OPERATOR AND THE PERFORMANCE OF THE INSTRUMENT CAN-
NOT BE GUARANTEED IF USED IN A MANNER NOT SPECIFIED BY REICHERT
TECHNOLOGIES.
WARNING: MODIFICATIONS TO THIS INSTRUMENT ARE NOT ALLOWED. ANY
MODIFICATION TO THIS UNIT MUST BE AUTHORIZED BY REICHERT OR SERI-
OUS INJURY TO THE OPERATOR OR PATIENT MAY OCCUR.
WARNING: IF THIS INSTRUMENT IS MODIFIED, APPROPRIATE INSPECTION
AND TESTING MUST BE CONDUCTED TO ENSURE CONTINUED SAFE USE
OF THIS INSTRUMENT.
WARNING: DO NOT USE THE TONO-PEN AVIA TONOMETER ON A PATIENT
WITHOUT AN OCU-FILM + TIP COVER OR INACCURATE READINGS MAY BE
OBTAINED.
WARNING: DO NOT USE AN OCU-FILM + TIP COVER ON MORE THAN ONE
PATIENT TO HELP PREVENT CROSS CONTAMINATION.
WARNING: IT IS IMPERATIVE THAT A FRESH OCU-FILM + TIP COVER BE USED
FOR EACH PATIENT FOR THE PROTECTION OF THE EYE AND THE TRANS-
DUCER ASSEMBLY. THE TRANSFER OF INFECTION IS THUS PREVENTED.
REPLACE OCU-FILM + TIP COVERS AFTER EXAMINATION OF EACH PATIENT.

68E3892 Rev. J 5
Warnings and Cautions (continued)
WARNING: DO NOT USE THE TONO-PEN AVIA TONOMETER IF THE TRANS-
DUCER ASSEMBLY IS CRACKED, CHIPPED OR SHOWS ANY IRREGULARITY
OF THE SURFACE, TO PREVENT PATIENT INJURY, AND/OR INACCURATE
READINGS.
WARNING: DO NOT USE EXCESSIVE PRESSURE DURING APPLANATION OR
EYE INJURY MAY OCCUR.
WARNING: THE CORNEAL SURFACE NEEDS ONLY TO BE MOMENTARILY
TAPPED, INDENTATION OR ADDITIONAL PRESSURE AFTER THE AUDIO
“CHIRP” TONE IS HEARD IS NOT REQUIRED AND MAY LEAD TO DAMAGE TO
THE EYE. IF MEASUREMENT PROCESS CAUSES PATIENT DISCOMFORT,
DEVICE DOES NOT SHOW A MEASUREMENT, OR IF DEVICE REQUIRES MUL-
TIPLE ATTEMPTS TO OBTAIN A MEASUREMENT, STOP THE EXAMINATION AND
REFER TO THE TROUBLESHOOTING SECTION OF THIS MANUAL.
WARNING: OCU-FILM + TIP COVERS CONTAIN NATURAL LATEX WHICH MAY
CAUSE ALLERGIC REACTIONS. QUESTION PATIENTS ABOUT ALLERGIES TO
LATEX BEFORE MEASURING THEM WITH THE TONO-PEN AVIA TONOMETER.
WARNING: DO NOT CARRY THE TONO-PEN AVIA POWERCEL BATTERY IN A
POCKET, OR CLOSE TO YOUR PERSON, AS A BURN INJURY MAY RESULT.
WARNING: THE BATTERY SHOULD ONLY BE REPLACED WITH THE BATTERY
SPECIFIED IN THIS MANUAL. USE OF ANOTHER BATTERY MAY CAUSE FIRE
OR AN EXPLOSION.
WARNING: DO NOT PLACE A SHORTING DEVICE BETWEEN THE BATTERY
TERMINALS, OR ALLOW THE BATTERY TO BECOME WET. MISUSE OR
IMPROPER DISPOSAL OF THIS BATTERY MAY CAUSE IT TO BECOME VERY
HOT, IGNITE OR EXPLODE. DAMAGE TO THIS UNIT AND/OR SERIOUS PER-
SONAL INJURY MAY RESULT.
WARNING: DO NOT RECHARGE THE BATTERY. THE BATTERY IS NOT
DESIGNED TO BE CHARGED BY ANY ELECTRICAL SOURCE. CHARGING
COULD GENERATE GAS AND INTERNAL SHORT-CIRCUITING, LEADING TO
DISTORTION, LEAKAGE, OVERHEATING, EXPLOSION OR FIRE.
WARNING: DO NOT EXPOSE THE BATTERY TO TEMPERATURES ABOVE
140ºF, DISASSEMBLE THE BATTERIES, OR DAMAGE TO THIS UNIT AND/OR
SERIOUS PERSONAL INJURY MAY RESULT.
-continued-

6 68E3892 Rev. J
Warnings and Cautions (continued)
WARNING: NEVER ALLOW LIQUID LEAKING FROM THE BATTERY TO GET IN
YOUR EYES OR MOUTH AS THIS LIQUID COULD CAUSE SERIOUS PERSONAL
INJURY. IF IT COMES IN CONTACT WITH YOUR EYES OR MOUTH, FLUSH
THEM IMMEDIATELY WITH PLENTY OF WATER AND CONSULT A PHYSICIAN.
WARNING: ALWAYS KEEP BATTERIES OUT OF THE REACH OF INFANTS
AND YOUNG CHILDREN TO PREVENT THEM FROM BEING SWALLOWED. IF
SWALLOWED, CONSULT A PHYSICIAN IMMEDIATELY.
WARNING: THE USE OF ACCESSORIES OR CABLES OTHER THAN THOSE
SPECIFIED, WITH THE EXCEPTION OF THOSE SOLD BY THE MANUFACTUR-
ER AS REPLACEMENT PARTS FOR INTERNAL COMPONENTS, MAY RESULT
IN INCREASED EMISSIONS OR DECREASED IMMUNITY OF THE EQUIPMENT
OR SYSTEM.
CAUTION: AN INSTRUCTION THAT DRAWS ATTENTION TO THE RISK
OF DAMAGE TO THE PRODUCT.
CAUTION: DO NOT USE THE TONO-PEN AVIA TONOMETER WITHOUT AN
OCU-FILM + TIP COVER TO PREVENT DAMAGE TO THE TRANSDUCER AS-
SEMBLY.
CAUTION: DO NOT TOUCH THE TRANSDUCER ASSEMBLY WITHOUT AN
OCU-FILM + TIP COVER APPLIED OR DAMAGE TO THE TRANSDUCER AS-
SEMBLY MAY RESULT.
CAUTION: DO NOT BUMP, JAR OR DROP THE DEVICE, OR DAMAGE TO THE
ELECTRONICS MAY OCCUR.
CAUTION: DO NOT IMMERSE THE TONO-PEN AVIA TONOMETER IN FLUIDS
OR DAMAGE TO THE ELECTRONICS MAY OCCUR.
CAUTION:
DO NOT USE SOLVENTS OR STRONG CLEANING SOLUTIONS ON
ANY PART OF THIS INSTRUMENT AS DAMAGE TO THE UNIT MAY OCCUR. SEE
MAINTENANCE SECTION FOR DETAILED CLEANING INSTRUCTION.
CAUTION: USE OF AMMONIA BASED CLEANERS ON THE LIQUID CRYSTAL
DISPLAY (LCD) MAY CAUSE DAMAGE TO THE DISPLAY. SEE MAINTENANCE
SECTION FOR DETAILED CLEANING INSTRUCTION.
CAUTION: DO NOT ATTEMPT TO STERILIZE THE TONO-PEN AVIA TONOM-
ETER OR DAMAGE TO THE ELECTRONICS MAY OCCUR.

68E3892 Rev. J 7
Warnings and Cautions (continued)
CAUTION: DO NOT AUTOCLAVE OR DISINFECT USING HIGH TEMPERA-
TURES EXCEEDING THE RECOMMENDED TEMPERATURES INDICATED IN
THE SPECIFICATIONS SECTION OF THIS MANUAL OR DAMAGE TO THE UNIT
MAY OCCUR.
CAUTION: DO NOT ATTEMPT TO MODIFY THE TONO-PEN AVIA TONOMETER
OR THE TONO-PEN AVIA POWERCEL BATTERY OR DAMAGE TO THE DEVICE
MAY OCCUR.
CAUTION: DO NOT STORE THE TONO-PEN AVIA TONOMETER WITHOUT AN
OCU-FILM + TIP COVER OR DEBRIS MAY ENTER THE TRANSDUCER ASSEM-
BLY AND CAUSE MALFUNCTIONS.
CAUTION:
MEDICAL ELECTRICAL EQUIPMENT NEEDS SPECIAL PRECAU-
TIONS REGARDING EMC AND NEEDS TO BE INSTALLED AND PUT INTO
SERVICE ACCORDING TO THE EMC INFORMATION PROVIDED IN THIS GUIDE.
PORTABLE AND MOBILE RF COMMUNICATIONS EQUIPMENT CAN AFFECT MEDI-
CAL ELECTRICAL EQUIPMENT.
CAUTION: ELECTROMAGNETIC INTERFERENCE FROM OTHER DEVICES
MAY AFFECT THIS INSTRUMENT. IF INTERFERENCE IS PRESENT, TURN OFF
OTHER ELECTRONIC DEVICES, OR REMOVE THEM FROM THE IMMEDIATE
AREA WHILE OPERATING THIS INSTRUMENT.
CAUTION: PORTABLE AND MOBILE RF COMMUNICATIONS EQUIPMENT CAN
EFFECT MEDICAL ELECTRICAL EQUIPMENT.
CAUTION: THIS INSTRUMENT IS NOT TO BE USED NEAR HIGH-FREQUENCY
EMITTING SURGICAL EQUIPMENT.
CAUTION: OCU-FILM + TIP COVERS SHOULD BE STORED BETWEEN 35°
AND 80° FAHRENHEIT (2°-27° CELSIUS).
CAUTION: EACH BOX OF HIGH QUALITY OCU-FILM + TIP COVERS HAS A
“USE BEFORE” DATE STAMPED ON THE BOX. WE SUGGEST USE OF OUR
OCU-FILM + BEFORE THIS DATE TO GUARD AGAINST THE POSSIBILITY
OF SHELF WEAR. THE LATEX MATERIAL USED IN THE OCU-FILM + TIP
COVERS CAN DEGRADE. A DEGRADED FILM MAY RESULT IN LEAKAGE
OF WETTING SOLUTION AND INSTRUMENT DAMAGE. EXAMINE EACH
OCU-FILM + TIP COVER FOR YELLOWING, CRACKS, OR A STICKY TEX-
TURE PRIOR TO USE.

8 68E3892 Rev. J
Symbols
Caution
REF Catalog Number
SN Serial Number
2017
Date of Manufacture
Manufacturer
Waste of Electrical and Electronic Equipment
Compliance to Medical Device Directive 93/42/EEC
Consult Instructions for Use
Authorized Representative in European Community
Fragile Contents in Shipping Container - handle with
care
Do not get Shipping Container wet
Type BF Applied Part
SYMBOLS FOR OCU-FILM + TIP COVERS ONLY
Do not reuse. Single Use
Use By
LOT Lot Number
Contains natural rubber latex

68E3892 Rev. J 9
Introduction
Congratulations on your purchase of the Tono-Pen AVIA®tonometer.
The Tono-Pen AVIA tonometer is a prescription only device
intended for measuring intraocular pressure (IOP) during routine
eye examinations or when increased intraocular pressure is
suspected by properly trained eyecare professionals such as
ophthalmologists, optometrists, opticians, and eye care technicians.
This User’s Guide is designed as a training and reference manual
for operation, maintenance, and troubleshooting. We recommend
that you read it carefully prior to use and follow the instructions in
the guide to ensure optimum performance of your new instrument.
If used properly, the Tono-Pen AVIA tonometer will provide you with
fast, accurate and reliable measurements for many years.
Properly trained eyecare professionals such as ophthalmologists,
optometrists, opticians and eye care technicians should operate
this instrument.
Please retain this manual for future reference and to share with other
users. For additional copies of this manual or questions related to the
Tono-Pen AVIA tonometer, contact your local authorized Reichert®
dealer or contact our Customer Service department directly at:
Tel: [phone]
Toll Free: 888-849-8955
Fax: [phone]
E-mail: [email protected]
Indications for Use
The indications for use include measuring intraocular pressure
(IOP) for suspected glaucoma, or when increased intraocular
pressure is suspected.
Contraindications
None.

10 68E3892 Rev. J
Introduction (continued)
Device Description
The Tono-Pen AVIA tonometer is an ergonomic, hand-held
tonometer that measures intraocular pressure. The body of the
instrument is designed to fit comfortably in the user’s hand,
facilitating fast and accurate measurements. The tip of the
Transducer Assembly converts applied force into an electrical
signal. The electronics housed in the ergonomic Tono-Pen AVIA
tonometer body process and analyze the waveforms produced by
each applanation of the corneal surface of the eye. These are used
to produce an averaged IOP measurement. The measurement is
displayed on the Liquid Crystal Displays (LCDs).
A replaceable battery compartment houses the Tono-Pen AVIA
POWERCEL®Battery, consisting of two Lithium Manganese
Dioxide batteries.
Features
The Tono-Pen AVIA tonometer has the following features:
• Easy to use - IOP can be measured reliably by medical
professionals.
• Portable - The Tono-Pen AVIA tonometer weighs just
71 g (2.4 oz) and is battery operated.
• Accurate - The measurements from the Tono-Pen AVIA
tonometer correlate strongly with Goldmann applanation
tonometry and direct measurements of IOP.
• Versatile - The Tono-Pen AVIA tonometer may be used easily
with the patient in any position, making the instrument suitable
for the office, in glaucoma clinics, at the hospital bedside, and in
remote locations.

68E3892 Rev. J 11
Introduction (continued)
Parts Identification
ATip - tonometer tip
BTransducer Assembly - housing for tonometer tip
CLCD - displays the IOP in mmHg, number of applanations
collected, statistical condence indicator, and battery life
status
DLED - green light on in Applanation Mode.
ETono-Pen AVIA POWERCEL Battery - battery
FActivation Button - Applanation Mode select button.
A
B
F
C
D
E
Figure 1. Key Features
Accessories
230577 Tono-Pen AVIA POWERCEL Battery
230651 Ocu-Film®+ Tip Covers (150 per box)
68C1334 Carrying Case
68E3892 User’s Guide
980051 Quick Reference Guide

12 68E3892 Rev. J
Instruction for Use
Tono-Pen AVIA Tonometer Modes
Power Up Mode
Pressing the activation button initiates the battery life, LCD,
Transducer Assembly, and electronic self-test. A successful power-
up puts the device automatically into applanation mode.
Applanation Mode
A 15 second interval within which the user should complete the 10
applanations needed to acquire an IOP value. During applanation
mode, the LCD will display the number of applanations collected.
After 10 applanations are collected, the LCD will display the IOP
along with a statistical confidence indicator. After 25 seconds,
the device will automatically go into a sleep mode. If the activation
button is pressed again the data will be lost and the unit will be
ready to start another measurement sequence.
Verification Mode
Pressing and holding the activation button for 5 seconds initiates
an electronic self test mode. See Tono-Pen AVIA Tonometer
Verification section for details.
Sleep Mode
A power-saving mode automatically activated after 25 seconds of
non-use. Pressing the activation button will initiate a power-up
mode.

68E3892 Rev. J 13
Instruction for Use (continued)
Tono-Pen AVIA Tonometer Verication
If suspect readings are observed, a verification test should be
performed. This will ensure that the Transducer Assembly and
electronics are performing correctly.
Verification
1. Hold the Tono-Pen AVIA tonometer with the Transducer
Assembly end pointing down towards the floor.
2. Press and hold the activation button for 5 seconds - a beep will
sound at one second intervals.
3. At the end of the 5 second button hold, the display will show [dn].
4. Keep the pen vertical, with the Transducer Assembly pointing
down towards the floor, for a total of 15 seconds.
5. At the end of this period, a beep will sound and the display will
show [UP].
6. Immediately point the Transducer Assembly straight up and
wait for the next beep (within 3 seconds).
Figure 2. Tono-Pen AVIA Verification Procedure
-continued-

14 68E3892 Rev. J
Instruction for Use (continued)
Verification (continued)
7. A properly functioning Tono-Pen AVIA tonometer will display
[PASS]. Pressing the activation button will now put the device
into Applanation Mode.
Figure 3. Tono-Pen AVIA Verification Pass
8. Verification test will need to be repeated if the display shows
[FAIL]. A single press of the Activation button will re-start the
verification test.
Note: The Tono-Pen AVIA tonometer will remain in the Verification
mode until it passes verification test.
9. The most common cause for failure is debris in the tip of the
Transducer Assembly. Follow the instructions for cleaning the tip
in the “Maintenance & Storage” section before re-performing the
verification test.
10. If this is unsuccessful, please contact the Reichert Technical
Service Department.

68E3892 Rev. J 15
Instruction for Use (continued)
Tono-Pen AVIA Tonometer Tones
The Tono-Pen AVIA tonometer generates two different tones.
A “BEEP” will sound when:
• Power Up Mode fails
• Verification Mode fails
• Applanation Mode starts
• IOP testing is completed
• IOP values are out of range (<5 or >55)
• At various points during the verification test.
A “CHIRP” will sound when:
• A valid IOP measurement has been taken during applanation.

16 68E3892 Rev. J
Instruction for Use (continued)
Battery Installation and Replacement
The Tono-Pen AVIA tonometer is supplied with a Tono-Pen AVIA
POWERCEL Battery that needs to be installed prior to use. The
Tono-Pen AVIA POWERCEL Battery is the only replacement
battery that can be used with this device.
1. Insert the Tono-Pen AVIA POWERCEL Battery into the base
of Tono-Pen AVIA tonometer until fully seated. The Battery is
“keyed” for correct installation.
2. Press the Activation Button.
3. Check that the battery symbol in the LCD has all segments
displayed.
4. Check that the Self-Test is initiated.
5. Dispose of used Batteries in accordance with local regulations.
Figure 4. Tono-Pen AVIA POWERCEL
Battery Installation and Replacement

68E3892 Rev. J 17
Instruction for Use (continued)
Liquid Crystal Display - User Interface
POWER UP MODE - USER INTERFACE SEQUENCE OF EVENTS
User Interface
LCD/Battery
Test
LED Off
Passed Battery Life Test/Passed
LCD Test
(SEE APPLANATION MODE)
POWER UP MODE - USER INTERFACE ERROR CODES
User Interface
Error Code
LED Off
Battery Level Critical
(when low, symbol will ash)
User Interface
Error Code
LED Off
Failed Self Test
APPLANATION MODE - USER INTERFACE SEQUENCE OF EVENTS
User Interface
Ready to
Measure
LED On, 1 Beep
Ready to Begin IOP Testing
(15 seconds for testing before
Time Out)
User Interface
Testing
Display
LED On
During Test, screen shows number
of applanations achieved
(in this case 4 of 10)
Each applanation taken equals
1 Chirp
User Interface
Test Complete
LED Off, 1 Beep
Test Complete
Patient has an IOP of 16 with a
statistical condence indicator of 95

18 68E3892 Rev. J
Instruction for Use (continued)
Liquid Crystal Display - User Interface (continued)
APPLANATION MODE - USER INTERFACE ERROR CODES
User Interface
Error Code
LED Off
Error - IOP value Under Range
(<5mm Hg)
User Interface
Error Code
LED Off
Error- IOP Value Over Range
(>55mm Hg)
User Interface
Error Code
LED Off
Timeout - not enough IOP
values collected
VERIFICATION MODE - SEQUENCE OF EVENTS
User Interface
Begin Verification
Mode
Hold Tono-Pen AVIA
tonometer with transducer
down towards floor
(LED Off)
User Interface
Invert Pen
Invert Tono-Pen AVIA
tonometer (LED Off)
User Interface
Successful
Verification
Successful Tono-Pen AVIA
tonometer verification (LED
Off)
VERIFICATION MODE - USER INTERFACE ERROR CODE
User Interface
Error Code
Unsuccessful Tono-Pen
AVIA tonometer verification
(LED Off)

68E3892 Rev. J 19
Instruction for Use (continued)
Tono-Pen AVIA Tonometer Preparation
1. Allow the instrument to thermally stabilize to room temperature
for approximately 30 minutes prior to use.
2. Remove the storage Ocu-Film + tip cover from the Transducer
Assembly.
3. Visually inspect the Transducer Assembly for cracks, chips
or other irregularities. Do not use if these conditions
are present.
4. Slide an Ocu-Film + Tip Cover onto the Transducer Assembly
until the ridge is seated, taking care not to apply the tip cover
too tightly or too loosely. Make certain that the rubber is at
across the tip, but not taut.
Figure 5. Tono-Pen AVIA Tonometer Preparation
Note: Use of the Ocu-Film + Tip Cover is required under original
Tono-Pen instrument warranty and service contract terms.
Note: Corneal topical anesthetic is required with tonometry.

20 68E3892 Rev. J
Instruction for Use (continued)
Verication Mode
A verification Test may be performed to ensure that the Transducer
Assembly and electronics are performing as expected. A verification
test may also be initiated if suspect readings are observed. (See
Tono-Pen AVIA Tonometer Verification section for details.)
If the verification test resulted with the LCD displaying [FAIL], repeat
the verification test, or reference the troubleshooting section for
potential causes for test failure.
Note: The Tono-Pen AVIA tonometer will remain in the Verification
mode until it passes verification.