Number of the sensor's measurement points, shown to the catalog's scale.
The largest sensor in the database has 327 680 points.
Published by the manufacturer
Quantified super resolution. As with the 872s, testo publishes the IFOV achieved after processing: 2.1 mrad versus 3.4 mrad natively. It's the only manufacturer in this comparison to quantify the actual spatial-resolution gain instead of just advertising a pixel count.
Specifications
Values come from manufacturer documentation unless otherwise
noted in the sources at the bottom of the page. This device has not been physically tested.
Identity
Brand
testo
Model
865s
Series
860 Series
Release year
not published by the manufacturer
Commercial status
current
EAN code
not published by the manufacturer
Manufacturer reference
0560 8651
Segment
S4
Sensor and image
Native resolution, width (px)
160
Native resolution, height (px)
120
Native detector pixels
19200
Displayed resolution, width (px)
320
Displayed resolution, height (px)
240
Interpolation ratio
4.0
Interpolation method
optical micro-scanning
Detector type
uncooled microbolometer
Detector material
not published by the manufacturer
Pixel pitch (µm)
not published by the manufacturer
Spectral band, min (µm)
7.5
Spectral band, max (µm)
14
NETD (mK)
100
NETD measurement conditions
not published by the manufacturer
Frame rate (Hz)
9
Optics
Horizontal field of view (°)
31
Vertical field of view (°)
23
Advertised IFOV (mrad)
3.4
Recalculated IFOV (mrad)
3.38
Minimum focus distance (m)
not published by the manufacturer
Focus
fixed
Interchangeable lenses
no
Digital zoom (×)
not published by the manufacturer
Macro lens
Availability
no
Reference
not applicable
Working distance (mm)
not applicable
Spot size (µm)
not applicable
Smallest measurable area (µm)
not applicable
Accuracy with macro (°C)
not applicable
Range max with macro (°C)
not applicable
Measurement
Range min (°C)
-20
Range max (°C)
280
Absolute accuracy (°C)
2
Relative accuracy (%)
2
Emissivity setting
not published by the manufacturer
Reflected temperature correction
not published by the manufacturer
Measurement modes
4
Simultaneous cursors
not published by the manufacturer
Full radiometry
yes
Visible channel
Visible camera (MP)
not published by the manufacturer
Image fusion
not published by the manufacturer
LED light
not published by the manufacturer
Laser pointer
not published by the manufacturer
Ergonomics and ruggedness
Screen (inches)
3.5
Screen resolution
320 × 240
Touchscreen
no
Weight (g)
not published by the manufacturer
Dimensions (mm)
not published by the manufacturer
IP rating
IP54
Drop resistance (m)
not published by the manufacturer
Operating temperature, min (°C)
not published by the manufacturer
Operating temperature, max (°C)
not published by the manufacturer
Power
Power type
system battery
Battery system
Battery testo 0554 8721 (shared with the 865s, 868s, 871s et 872s)
Battery life (h)
4
Charging connector
not published by the manufacturer
Storage and connectivity
Internal memory (GB)
not published by the manufacturer
Memory card
not published by the manufacturer
Wi-Fi
no
Bluetooth
not published by the manufacturer
Wired interface
USB
File formats
not published by the manufacturer
Software
PC software
testo IRSoft
Free PC software
yes
Mobile app
not applicable
Report generation
yes
Cloud service
not published by the manufacturer
Compliance
Calibration certificate provided
not published by the manufacturer
Declared standards
not published by the manufacturer
Warranty (months)
not published by the manufacturer
Support in France
yes
Observations
testo's entry-level model. A NETD of 100 mK, the highest in the professional building segment of this comparison, and a range capped at 280°C.
Neither ε-Assist, nor a mobile app, nor wireless connectivity, unlike the 868s: that's the main difference between the two, with an identical sensor.
IFOV warning. A square cursor on-screen shows the real size of the measurement spot at the targeted distance, preventing you from measuring an object smaller than the spot. A feature present across the entire testo range and absent everywhere else.
ScaleAssist automatically sets the thermal scale to make two images comparable from one visit to the next.
A removable battery shared across the entire 860 series and the 872s. One set of batteries serves several devices.
Neither weight, nor dimensions, nor pixel pitch, nor NETD conditions are published.