Air/Water/Soil Temp Sensor (20' cable) - TMC20-HD

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Measure temperature in air, water, or soil with the 6.1m (20 ft)  TMC20-HD temperature sensor. This product is designed to be used with HOBO U-Series, UX120-006M external-channel data loggers or ZW series wireless datanodes. This sensor records temperatures between -40° and 50°C (-40° to 122°F) in water or soil, and between -40° and 100°C (-40° to 212°F) in air. This product provides a response time of minutes typical to 90% in air moving 1 m/sec (2.2 mph); and 1 minute typical to 90% response time in stirred water. Please note, accuracy and resolution depend on data logger.

Can be plugged directly into the external input jacks of U12, UX120, or ZW Family loggers to expand the range of measurement options and applications.

The TMC20-HD Sensor is for use in Indoor , Outdoor and Underwater environments

The TMC20-HD Sensor supports the following measurements:

Temperature, Water Temp

Onset # TMC20-HD

Plot A

Plot B

Plot C

Plot D

Measurement Range: -40° to 50°C (-40° to 122°F) in water; -40° to 100°C (-40° to 212°F) in air
w/U12: ±0.25°C from 0° to 50°C (±0.45°F from 32° to 122°F), insert probe 2.3 cm (0.9 inches) minimum; see Plot A
w/ZW: ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F), insert probe 2.3 cm (0.9 inches) minimum; see Plot B
w/UX120-006M: ±0.15°C from 0° to 70°C (±0.27°F from 32° to 158°F), insert probe 2.3 cm (0.9 inches) minimum; see Plots C & D
w/U12: 0.03° at 20°C (0.05° at 68°F); see Plot A
w/ZW: 0.02°C at 25°C (0.04°F at 77°F); see Plot B
w/UX120-006M: 0.002° at 25°C (0.003° at 77°F); see Plots C & D
Drift: <0.1°C (<0.2°F) per year
Response time in air: 2 min. typical to 90% in air moving 1 m/sec (2.2 mph)
Response time in stirred water: 30 sec. typical to 90%.
Operating range: Sensor tip and cable immersion in fresh water up to +50°C (122°F) for 1 year
Housing: Copper-plated sensor tip
Dimensions: 5.1 x 33 mm (0.2 x 1.3 inches)
Weight: 34 g (1.1 oz)

Compatible Loggers
Part Number
USB Data Loggers - optional external sensors
Temperature/Relative Humidity/Light/External
Temperature/Relative Humidity/2 External Channel
USB Data Loggers - requires external sensor
4-Channel External
This item is discontinued.
The upgrade for this product is the UX120-006M
4-Channel External
4-Channel Analog
Wireless Data Nodes - via receiver/USB
4 Channel - Temperature/Relative Humidity Data Node
data node – Temperature/Relative Humidity/2 External Channels
data node – 4 Analog Ports
4 External Channels - Data Node
Documentation for the TMC20-HD


The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below.

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