HOBO®
MX
Soil
Moisture
(MX2306)
and
MX
Soil
Moisture
and
Temperature
(MX2307)
Data
Logger
Manual
26456
‐
A
The
HOBO
MX
Soil
Moisture
(MX2306)
and
HOBO
MX
Soil
Moisture
and
Temperature
(MX2307)
data
loggers
measure
soil
moisture
and
temperature
in
numerous
soil
types,
including
high
salinity
and
sandy
soil.
These
Bluetooth®
‐
enabled
loggers
are
designed
for
wireless
communication
with
a
phone,
tablet,
or
computer.
Using
the
HOBOconnect®
app,
the
user
can
easily
configure
the
logger
and
then
download
logged
data
to
view
or
export
for
further
analysis.
The
loggers
can
calculate
minimum,
maximum,
average,
and
standard
deviation
statistics
and
be
configured
to
indicate
alarms
at
user
‐
specified
thresholds.
The
loggers
also
support
burst
logging,
in
which
data
is
logged
at
a
faster
interval
when
sensor
readings
are
above
or
below
certain
limits.
Specifications
Measurement
Range
(select
one
at
configuration)
0.00
to
0.64
m³/m³
VWC
in
mineral
soils
0.00
to
0.70
m³/m³
VWC
in
soilless
media
Apparent
Dielectric
Permittivity:
1
(air)
to
80
(water)
Accuracy
*
±0.031
m³/m³
typical
in
mineral
soils
that
have
solution
EC
<8
dS/m
±0.051
m³/m³
typical
in
soilless
media
Apparent
Dielectric
Permittivity:
+/
‐
1
Ɛ
a
for
the
range
1
to
40
(soil
range);
+/
‐
15%
for
over
40
Resolution
0.001
m³/m³
Apparent
Dielectric
Permittivity:
0.1
Ɛ
a
Dielectric
Measurement
Frequency
70
MHz
Volume
of
Influence
430
ml
Percent
of
Field
Capacity
(for
VWC
measurements
only)
Range:
0
to
200%
Resolution:
0.1%
Temperature
Sensor
(MX2307)
Range
‐
40
to
100°C
(
‐
40
to
212°F),
with
tip
and
cable
immersion
in
fresh
water
up
to
50°C
(122°F)
for
one
year
Accuracy
±0.25°C
from
‐
40
to
0°C
(±0.45
from
‐
40
to
32°F)
±0.2°C
from
0
to
70°C
(±0.36
from
32
to
158°F)
±0.25°C
from
70
to
100°C
(±0.45
from
158
to
212°F)
Resolution
0.04°C
(0.072°F)
Drift
<0.01°C
(0.018°F)
per
year
Response
Time
3
minutes
in
air
moving
1
m/s;
20
seconds
in
stirred
water
4
minutes
in
air
moving
1
m/s
with
RS3
‐
B
Solar
Radiation
Shield
Logger
Operating
Range
‐
25°
to
60°C
(
‐
13°
to
140°F)
Radio
Power
1
mW
(0
dBm)
Transmission
Range
Approximately
30.5
m
(100
ft)
line
‐
of
‐
sight
Wireless
Data
Standard
Bluetooth
Low
Energy
(Bluetooth
Smart)
Logging
Rate
1
second
to
18
hours
Logging
Modes
Fixed
interval
(normal,
statistics)
or
burst
Memory
Modes
Wrap
when
full
or
stop
when
full
Start
Modes
Immediate,
push
button,
date
&
time,
or
next
interval
Stop
Modes
When
memory
full,
push
button,
date
&
time,
or
after
a
set
logging
period
HOBO
MX2306
and
MX2307
Data
Loggers
Models:
Soil
Moisture
(MX2306)
Soil
Moisture
and
Temperature
(MX2307)
Included
Items:
Screws
Cable
ties
Required
Items:
HOBOconnect
app
Mobile
device
with
Bluetooth
and
iOS,
iPadOS®,
or
Android™,
or
a
Windows
computer
with
a
native
BLE
adapter
or
supported
BLE
dongle
Accessories
(sold
separately):
Solar
radiation
shield
(RS3
‐
B
for
use
with
MX2307)
Soil
moisture
verification
clip
(TEROS
‐
CLIP)
Replacement
battery
(HRB
‐
2/3AA)
MX2307
Model
Shown
