> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
product.
Symbols and writing standards
Warning advice, risk level according to the
signal word:
Warning! Serious physical injury may occur.
Caution! Slight physical injury or damage to
the equipment may occur.
> Implement the specified precautionary
measures.
Note: Basic or further information.
1. ...
2. ...
Action: more steps, the sequence must be
followed.
> Dispose of faulty rechargeable batteries/spent batteries in
accordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
3 Specifications
regulations) or return the product to Testo for disposal.
Testo Smart Probes are different hand-held measuring instruments
for various applications that communicate with your mobile terminal
devices by means of an app. The respective Smart Probe performs
the measurement and is operated by your mobile terminal device.
The various Smart Probes allow you to measure the temperature,
humidity, flow, and volume flow at the outlet, or perform pressure,
differential pressure, and non-contact temperature measurements
in the duct.
1 Measuring unit
2 LED
3 Key
4 Battery compartment (at the back)
5 Direction of flow testo 405i / testo 410i (not shown)
(An arrow on the top of the housing displays the direction of
flow in which the measuring instrument has been calibrated and
which achieves the best measurement results. Please note the
direction of flow during usage.)
4.2.LED status
LED status Meaning
Flashing red Low battery status
Flashing yellow
Flashing green
8
• Smart Probe is switched on.
• Smart Probe is searching for a BT connection, but is
not connected.
2. Press next to the application that you would like to
designate as a favourite.
- The asterisk is displayed in orange , and the selected
application is listed under Show Favorites.
6.3.3. Displaying information about an application
1. Press .
- A selection of applications is displayed.
2. Press .
- The information about an application is displayed.
6.4. Displaying Smart Probe details
✓ One or more Smart Probes are connected to your mobile
terminal device via Bluetooth.
1. Press .
- All connected Smart Probes are displayed in this list.
2. Select the Smart Probe to display the details you would like to
see.
- A list appears with the details for the Smart Probe.
3. Press Close to exit the detailed view.
6 Using the App
6.5. List, graphic diagram and table view
The available readings can be displayed in different ways in the
various views.
• List view
Displays the readings transmitted by the Smart Probe in the
form of a list. Readings from all connected Smart Probes are
displayed here.
• Graphic diagram view
The graphical progression of up to four different readings can
be displayed. Tap on a reading above the diagram to select the
readings to be displayed.
• Table view
In the Table view, all readings are displayed in sequence
according to date and time. The different readings from the
individual Smart Probes can be selected by pressing ◄ ►.
- A selection of sending/export options is displayed.
7 Maintaining the product
4. Tap on the sending/export option you need.
7.1.Maintaining Smart Probes
Cleaning the instrument
> Do not use any aggressive cleaning agents or solvents!
> Mild household cleaning agents or soap suds may be used.
> If the housing of the instrument is dirty, clean it with a damp
cloth.
Keeping connections clean
> Keep connections clean and free of grease and other deposits,
clean with a damp cloth as required.
7 Maintaining the product
Ensuring measuring accuracy
> Testo Customer Service would be glad to further assist you if
you so wish.
> Keep within the permissible measuring range!
> Calibrate instrument regularly (recommendation: once a year).
7.2. Smart Probes App
The testo Smart Probes App is kept updated via the Play Store for
Android devices and the App Store for iOS devices. Please update
the App as soon as a new update is available. We therefore
recommend that you do not disable automatic notifications when
All accuracy specifications apply at a nominal temperature
9 Technical data
9.1. Bluetooth module
The use of the wireless module is subject to the
regulations and stipulations of the respective country of
use, and the module may only be used in each case in
countries for which a country certification has been
granted.
The user and every owner undertake to adhere to these
regulations and prerequisites for use, and acknowledge
that the re-sale, export, import, etc. in particular in, to or
from countries without wireless permits, is their
responsibility.
9.2. General technical data
of 22 °C.
9.2.1.testo 905i
Feature Values
Measuring range -50 to 150 °C / -58 to 302 °F
Accuracy ± 1 digit ± 1 °C / ± 1.8 °F
Resolution 0.1 °C / 0.1 °F
Measurement rate 1/sec
Available units of
measurement
Storage temperature -20 °C to 60 °C / -4 to 140 °F
Operating temperature -20 °C to +50 °C / -4 to 122 °F
Battery type 3 micro batteries AAA
Battery life 150 h
Dimensions 222 mm × 30 mm × 24 mm
Directives, standards
and tests
°C, °F
Probe shaft length 100 mm
Probe shaft diameter 4 mm
“Este equipamento opera em caráter secundário, isto é, não tem direito a proteção
contra interferência prejudicial, mesmo de estações do mesmo tipo, e não pode causar
This instrument complies with Part 15C of the FCC Rules and
Industry Canada RSS-210 (revision 8). Commissioning is subject to
the following two conditions:
(1) This instrument must not cause any harmful interference and
(2) this instrument must be able to cope with interference, even if
this has undesirable effects on operation.
Cet appareil satisfait à la partie 15C des directives FCC et au standard Industrie Canada RSS-210
(révision 8). Sa mise en service est soumise aux deux conditions suivantes :
(1) cet appareil ne doit causer aucune interférence dangereuse et
(2) cet appareil doit supporter toute interférence, y compris des interférences qui provoquerait des
opérations indésirables.
Information from the FCC (Federal Communications Commission)
Shielded cables should be used for a composite interface. This is to ensure continued protection
against radio frequency interference.
This equipment has been tested and found to comply with the limits for a Class C digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment. Shielded interface cable must be used in order to
comply with the emission limits.
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to
the following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause undesired operation
of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts
de licence. L'exploitation est autorisée aux deux conditions suivantes :
(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est
susceptible d'en compromettre le fonctionnement.
Caution: Radio Frequency Radiation Exposure
This equipment complies with IC radiation exposure limits set forth for an uncontrolled environment and
meets the IC radio frequency (RF) Exposure Guidelines. This equipment should be installed and
operated keeping the radiator at least 20 cm or more away from person´s body in normal use position
to ensure compliance with RF exposure requirement.
Co-Location:
This transmitter must not be co-located or operated in conjunction with any other antenna or
transmitter.
Attention : exposition au rayonnement de radiofréquences
Cet équipement est conforme aux limites d'exposition aux radiofréquences IC fixées pour un
environnement non contrôlé et aux Lignes directrices relatives à l'exposition aux radiofréquences (RF).
Cet équipement doit être installé et utilisé en gardant le radiateur à une distance d'au moins 20 cm du
corps humain en position normale d’utlisation pour garantir la conformité a d'exposition aux RF.
Ce transmetteur ne peut pas être installé en colocation ou être utilisé avec une autre antenne ou
transmetteur, quel qu'en soit le type.
FCC Warnings
Information from the FCC (Federal Communications Commission)
For your own safety
Shielded cables should be used for a composite interface. This is to ensure continued protection
against radio frequency interference.
FCC warning statement
This equipment has been tested and found to comply with the limits for a Class C digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
Caution
Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment. Shielded interface cable must be used in order to comply
with the emission limits.
Warning
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received,
including interference that may cause undesired operation.
Caution: Radio Frequency Radiation Exposure
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment
and meets the FCC radio frequency (RF) Exposure Guidelines. Exposure Guidelines. This equipment
should be installed and operated keeping the radiator at least 20 cm or more away from person´s body
in normal use position to ensure compliance with RF exposure requirement.
Co-Location:
This transmitter must not be co-located or operated in conjunction with any other antenna or
transmitter.