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![Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-004-800x800.webp "Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger")
![Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-1-800x800.webp "Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger")
![Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-800x800.webp "Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger")
![Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-004-100x100.webp "Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger")
![Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-1-100x100.webp "Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger")
![Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-100x100.webp "Onset HOBO U23-004 [U23-004] Pro v2 External Temperature Data Logger")
The Onset HOBO U23-004 Pro v2 External Temperature Data Logger is a weatherproof data logger with an external soil/water temperature sensor on a 6-foot cable useful for situations where just one temperature probe is required. An internal temperature sensor is also included.
Note: U23-004 data loggers require the HOBOware software (free to download) to operate. Please also note that a USB interface cable comes with the purchase of a HOBOware Pro CD (BHW-PRO-CD), only.
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![Onset HOBO U23-003 [U23-003] Pro v2 2x External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-003-200x200.webp "Onset HOBO U23-003 [U23-003] Pro v2 2x External Temperature Data Logger")
![Onset HOBO U23-003 [U23-003] Pro v2 2x External Temperature Data Logger](image/cache/wp/gj/Products/Hobo_U23-1-200x200.webp "Onset HOBO U23-003 [U23-003] Pro v2 2x External Temperature Data Logger")
![Onset HOBO Pendant [UA-001-08] 8K Temperature/Alarm Data Logger](image/cache/wp/gj/Products/Hobo_UA00108-200x200.webp "Onset HOBO Pendant [UA-001-08] 8K Temperature/Alarm Data Logger")
![Onset HOBO Pendant [UA-001-08] 8K Temperature/Alarm Data Logger](image/cache/wp/gj/Products/Hobo_pendant-1-200x200.webp "Onset HOBO Pendant [UA-001-08] 8K Temperature/Alarm Data Logger")
![Onset HOBO U23-002 [U23-002] Pro v2 External Temperature/Relative Humidity (RH) Data Logger](image/cache/wp/gj/Products/Hobo_U23-002-200x200.webp "Onset HOBO U23-002 [U23-002] Pro v2 External Temperature/Relative Humidity (RH) Data Logger")
![Onset HOBO Pendant [PENDANT] Temperature Data Loggers](image/cache/wp/gj/Products/Hobo_Pendant-Series-200x200.webp "Onset HOBO Pendant [PENDANT] Temperature Data Loggers")
