Data sheet
testo 835

Infraredthermometertesto 835 – fast, accurate
infrared measuring instruments
for trade and industry

Measure safely and accurately even at high temperatures°C

4-point laser shows the exact measuring range, preventing
incorrect measurements%RH

Safe measurements from a long distance, thanks to 50:1
opticsIntegrated emissivity measurement for absolute measuring
reliability
Patented surface moisture measurement (testo 835-H1)
Convenient menu guidance with icons and joystick
Measuring value and location memory, and data analysis on
the PC with free PC software „EasyClimate“

Take advantage of the benefits the testo 835 series has

Testo infrared measuring technology, which delivers

to offer, in virtually all sectors of trade and industry: e.g.

first-class results even at long distance, is particularly

monitoring wall temperature and humidity, inspecting air

helpful when monitoring the temperature of objects thatconditioning and ventilation systems, the maintenanceare small, moving, difficult to access or extremely hot.

of industrial systems or the quality control of industrially

The many features increase the room for manoeuvre, formanufactured products.

example in the building trade when carrying out surface
moisture measurement via infrared, or in the metal, glassand ceramics industry when measuring temperatures up to1500 °C. So you can be certain of having everything undercontrol and of safeguarding your standards of quality at alltimes.

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testo 835

Ordering data
testo 835-T1
Get started in the field of intelligent infrared measuring
technology

testo 835-T2
The pro when it comes to high temperatures

Maximum safety and precision when measuring theMeasure precise temperatures of up to 1500 °C from a safe

temperature of smaller objects from a reasonable distance,

distance thanks to its extended temperature measuringe.g. monitoring wall temperature, troubleshooting in heating

range, e.g. when monitoring product temperature in theand air conditioning systems, or the quality control ofglass, ceramics and metal industry.

industrially manufactured products.

testo 835-T1

testo 835-T2

testo 835-T1, infrared temperature measuring
instrument, 4-point laser marking, measurement
data administration, incl. free download of PC
software, batteries and calibration protocol

testo 835-T2, infrared high temperature
measuring instrument, 4-point laser marking,measurement data administration, incl. freedownload of PC software, batteries andcalibration protocol

Part no. 0560 8351

Part no. 0560 8352

testo 835-H1
Special instrument with integrated humidity module

Use its unique, patented infrared surface moisturemeasurement feature to detect the risk of mould in building
fabrics early enough, measure humidity or check the dew
point distance, for example.

testo 835-H1
testo 835-H1, infrared temperature measuring
instrument, 4-point laser marking, measurement
data administration, incl. free download of
PC software, humidity module, batteries andcalibration protocol
Part no. 0560 8353

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Technical data
testo 835-T1

testo 835-T2

testo 835-H1

Sensor type Infrared
Optics50:1 (regarding the distance of 2.0 m to measuring object typically) + opening diameter of the sensor (24 mm)

Meas. spot marking

4 point laser

Spectral range

8 to 14 µm

Measuring range-30 to +600 °C-10 to +1500 °C-30 to +600 °C

Accuracy±1 digit±2,5 °C (-30,0 to -20,1 °C )±1,5 °C (-20,0 to -0,1 °C )±1,0 °C (+0,0 to +99,9 °C )±1% of m.v. (remaining range )±2,0 °C or ±1% of m.v.

±2,5 °C (-30,0 to -20,1 °C )±1,5 °C (-20,0 to -0,1 °C )±1,0 °C (+0,0 to +99,9 °C )±1% of m.v. (remaining range )Resolution

0,1 °C

0,1 °C (-10,0 to +999,9 °C )1 °C (+1000,0 to +1500,0 °C )0,1 °C

Sensor type Type K (NiCr-Ni)
Measuring range-50 to +600 °C-50 to +1000 °C

Accuracy±1 digit±(-0.5 °C +0.5% of m.v.)

Resolution

0.1 °C-50 to +600 °CSensor type Testo humid. sensor, cap.
Measuring range–

0 to 100 %RH

Accuracy±1 digit–±2 %RH±0.5 °C

Resolution–

0.1 °C
0.1 %RH
0.1 °Ctd

General technical data
Emissivity
Emissivity table
Laser spot
MemoryAlarm (upper/lowerlimit)

0.10 to 1.00 (steps 0.01)
20 values storable
On / off
200 values storable
IR temperature, TC temperature

Alarm signal

audible, optical

Operating temperature-20 to +50 °C

Storage temperature-30 to +50 °C

Housing material
Dimensions
WeightABS + PC
193 x 166 x 63 mm
514 g

Battery type3 batteries Type AA (or USB operating with PC-Software)

Battery life

25 h (typical 25°C without laser and backlight)
10 h (typical 25°C without backlight)

Display

Dot matrix

Auto-Off (disabledfor continuousmeasurement andUSB connection)

Backlight: 30 s
Instrument: 120 s

Standards

EN 61326-1:2006

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testo 835

Accessories
Accessories

4Part no.

Bracket0440 0950

USB connection cable instrument to PC0449 0047

Adhesive tape, e.g. for reflective surfaces (roll, L.: 10 m, W.: 25 mm)

0554 0051

Silicone heat paste (14g), Tmax = +260°C

0554 0004

ISO calibration certificate/temperature; infrared thermometer; calibration points +60°C; +120°C; +180°C

0520 0002

ISO calibration certificate/temperature; infrared thermometers, calibration points -18°C, 0°C, +60°C

0520 0401

ISO calibration certificate/temperature; meas. instr. with air/immersion probe; cal. points 0°C; +150°C; +300°C

0520 0021

Service case for measuring instrument, probe and accessories, dimensions 454 x 316 x 111 mm

0516 8451

PC software testo EasyClimate for data analysis0501 0485

testo 835

Information on contact measurement• Observe the minimum penetration depth for immersion/penetration probes: 10x probe diameter• Avoid using in aggressive acids or alkalis
Measuring range, distance
Depending on the distance of the measuring instrument from the measurement object, a specific measuring range isrecorded.
Measuring lens (ratio of distance : measuring range)
In italics = laser
Not in italics = measuring range

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testo 835

ProbesProbe type

Dimensions
Probe shaft/probe shaft tip

Measuringrange

Accuracyt99

Part no.

-60 to +400 °C

Class 2 1)

200 s

0602 1793-60 to +1000 °C

Class 1 1)

2s0602 0593-60 to +800 °C

Class 1 1)

3s

0602 2693-200 to+1000 °C

Class 1 1)

5s

0602 5792-60 to +400 °C

Class 2 1)

7s

0602 1293-60 to +300 °C

Class 2 1)

3s0602 0393

0 to +300 °C

Class 2 1)

5s0602 0193-60 to +400 °C

Class 2 1)

30 s0602 1993-60 to +300 °C

Class 2 1)

3s0602 0993-60 to +1000 °CClass 1 1)

20 s

0602 0693

Air probes
Robust air probe, T/C Type K,
Fixed cable 1.2 m

115 mm
Ø 4 mmImmers./penetr. probes
Efficient and fast-action immersion
probe, waterproof, TC Type K,
Fixed cable 1.2 m

Ø 1.5 mm
300 mmFast-action, waterproof immersion/penetration probe, TC Type K,
Fixed cable 1.2 m

60 mm

14 mm

Ø 5 mmØ 1.5 mm

Immersion tip, flexible, TC Type KØ 1.5 mm

Waterproof immersion/penetration
probe, TC Type K, Fixed cable
1.2 m

500 mm

114 mm

50 mm

Ø 5 mmØ 3.7 mmSurface probes
Fast-action surface probe withsprung thermocouple strip, alsofor uneven surfaces, measurement
range short-term to +500°C, TC
Type K, Fixed cable 1.2 m
Fast-reaction paddle surface
probe, for measurements ininaccessible places, e.g. narrow
apertures and slots, TC Type K,
Fixed cable
Waterproof surface probe withwidened measurement tip for flat
surfaces, T/C Type K, Fixed cable
1.2 m
Fast-action surface probe withsprung thermocouple strip,bent, also for uneven surfaces,
measurement range short-term to+500°C, TC Type K, Fixed cable
1.2 m
Efficient, waterproof surface
probe with small measurement
head for flat surfaces,
TC Type K, Fixed cable 1.2 m

115 mm
Ø 5 mm

145 mmØ 12 mm

40 mm

Ø 8 mm

115 mm
Ø 5 mm

Ø 6 mm

80 mm

50 mm

Ø 5 mmØ 12 mm

150 mmØ 2.5 mm

Ø 4 mm1) According to norm EN 60751, the accuracy of Classes 1 / 2 refers to -40 to +1000/+1200 °C.

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testo 835

Probes

Probe type

Dimensions
Probe shaft/probe shaft tip

Measuringrange

Accuracyt99

Part no.

-50 to +250 °C

Class 2 1)

3s0602 2394

-50 to +170 °C

Class 2 1)

0602 4792-50 to +400 °C

Class 2 1)

0602 4892-50 to +120 °C

Class 1 1)

90 s

0628 0020-60 to +130 °C

Class 2 1)

5s0602 4592-60 to +130 °C

Class 2 1)

5s0602 0092-50 to +100 °C

Class 2 1)

5s0602 4692-60 to +400 °C

Class 2 1)

7s

0602 2292

Surface probes
Flat head surface probe withtelescopic handle max. 680 mm formeasurements at hard-to-accesspoints, TC Type K, Fixed cable 1.6m (correspondingly shorter whentelescope extended)

Magnetic probe, adhesive force
approx. 20 N, with magnets, formeasurements on metal surfaces,
TC Type K, Fixed cable 1.6 m
Magnetic probe, adhesive force
approx. 10 N, with magnets, forhigher temp., for measurements on
metal surfaces, TC Type K, Fixedcable 1.6 m
Pipe wrap probe with velcro strip;
for temperature measurement onpipes with diameter up to max. 120mm; Tmax. +120 °C; TC Type K ,Fixed cable 1.5 m

985 ±5 mm

12 mm
Ø 25 mm

35 mm
Ø 20 mm

75 mm
Ø 21 mm

395 mm
20 mm

Pipe wrap probe for pipe diameter
5 to 65 mm, with exchangeable
measuring head. Meas. range
short-term up to +280 °C, TC TypeK, Fixed cable 1.2 m
Spare meas. head for pipe wrap
probe, TC Type K

35 mm
15 mm

Clamp probe for measurements onpipes, pipe diameter 15 to 25 mm(max. 1“), meas. range short-term
up to +130°C, TC Type K, Fixedcable 1.2 m
Food probes
Waterproof food probe made ofstainless steel (IP65), TC Type K,
Fixed cable 1.2 m

125 mm

30 mm

Ø 4 mmØ 3.2 mm1) According to norm EN 60751, the accuracy of Classes 1 / 2 refers to -40 to +1000/+1200 °C.

7Subject to change without notice.

0981 9014/msp/I/03.2021

testo 835

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