Element

Function

1234

Infrared lens
4-point laser
Humidity probe (only H1)
Trigger

IR measurement
Measuring spot marking
Measures the relative humidity- Switches the instrument on.
- Starts / ends a measurement.

56Battery compartment
USB interface / probe
connection socket

Contains 3x AA batteries.
- For connecting the instrument to the PC toconnect to the EasyClimate software.
- Connection of a probe.

Element

Humidity measurement (environment anddewpoint) – ambient temperature (only H1)

8 ESC
9101112 HOLD / SCAN

Takes the user a step back in the menu selection.
Switches the testo 835 on or off.
Saves the measured readings.
Setting emissivity- Scan: while the trigger is held down and themeasurement is carried out.
- Hold: displays the measured values.

13 Time14 Reading display

Displays the current time.
Displays the measured readings.
Surface temperature (IR)Max. IR temperature
IR temperature
Min. IR temperature

Max[°C/°F]Min[°C/°F][%RH]

Ambient humidity[°C/°F]

Ambient temperature[°Ctd/°Ftd])

Ambient dewpoint temperature.

MinDewpoint distance measurement (only H1)
Temperature difference IR minus dewpoint max
currentmin.

Maxaw[-]
Min

Surface moisture measurement (only H1)
Surface moisture max.
currentmin.

Max[°CDtd/°FDtd]- Joystick for confirming a selection.
- For navigating in the menu

7

Function

Calculated from dewpoint, ambient air andsurface temperature- 0.00 - 0.64: non-critical- 0.65 - 0.80: poss. critical- 0.81 - 1.00: critical
15
161718

Displays the battery charge status.
Displayed if alarm is switched on.
Displays the selected emissivity.
Displayed if laser is switched on.

Connecting the thermocouple probe

Differential (surface temperature - external probe
temperature)
TC temperature
IR temperature
Temperature difference TC / IR measurement
TC probe must be connected.

1 - Connect the connecting plug to the probe socket (6).
Switching the instrument on
1 - Press

(9).

- OR
- Press Trigger (4).

[%RH]

Humidity measurement (environment + dewpoint +IR) (only H1)
Ambient humidity[°C/°F]IR temperature[°Ctd/°Ftd])

Ambient dewpoint temperature

Switching the instrument off
1 - Hold down(9) until the display goes off.

If no button is pressed for 2 minutes, the instrument switches off
automatically.
12Carrying out the measurement

Measuring lens1 - Hold down Trigger (4).

(Ratio of distance: measuring range)

2 - Release Trigger (4) to end the measurement.

Depending on the distance of the measuring instrument from the measurement
object, a specific measuring range is recorded.

3 - Move(7) up / down to change the reading display.

In italics = laser

www.testo.com

Not in italics = measuring range

Making settings
1 - Press

testo 835-H1
short instruction(7) to open the menu.

2 - Move and press(7) to select the menu item.

3 - Moving and pressing(7) applies the settings.

Setting the emissivity
Materials have various emissivities, i.e. they emit various amounts ofelectromagnetic radiation. The emissivity of the instrument has a default
setting of 0.95. This is ideal for the measurement of non-metals (paper,ceramic, gypsum, wood, paints and varnishes), plastics and foodstuffs.
1 - Press(11).
Managing the measurement data and other measurement options

2 - For Customise manual and Customise auto,move

3 - Press(7) right to enter the emissivity.

Please download the free testo EasyClimate software for managing and archiving
your measurement data and for carrying out an online measurement.

For Customise auto, please refer to the instruction manual.

You will find the link to download it here: www.testo.com/download-center(7) to confirm the selected emissivity.

Creating a storage location and saving readings
1 - Press(10) to open the memory function.

2 - Select New Location.
3 - Move(7) up / down or right / left to name the storage location.

4 - Confirm storage with.
These brief instructions describe the basic operating steps. Please refer tothe instruction manual to find out how to handle the product safely and for
detailed information.
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