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![Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station](image/cache/wp/gj/Products/Hobo_BASE-U-4-800x800.webp "Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station")
![Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station](image/cache/wp/gj/Products/Hobo_BASE-U-4-1-800x800.webp "Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station")
![Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station](image/cache/wp/gj/Products/Hobo_BASE-U-4-100x100.webp "Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station")
![Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station](image/cache/wp/gj/Products/Hobo_BASE-U-4-1-100x100.webp "Onset HOBO BASE-U-4 [BASE-U-4] Optic USB Base Station")
The Universal Optic USB Base Station and couplers are used to offload data from any HOBO® data logger with an Optic USB interface. The splash-resistant Optic USB Base Station connects to your computer via USB, while connecting to the data logger via an appropriate coupler. This is compatible with the HOBO UA, U20, U22, U23, UTBI, U24 & U26 series.
NOTE: Couplers for all compatible data loggers are included with the BASE-U-4. Couplers are included for compatibility with six of our most popular data logger types including: UA Pendants, U20 water level data loggers, the U22 Water Temp Pro v2, our UTBI TidbiT, U24 Conductivit,y and U23 data loggers.
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![Onset HOBO RG3 [RG3] Data Logging Rain Gauge](image/cache/wp/gj/Products/Hobo_RG3-200x200.webp "Onset HOBO RG3 [RG3] Data Logging Rain Gauge")
![Onset HOBO RG3 [RG3] Data Logging Rain Gauge](image/cache/wp/gj/Products/Hobo_RG3-2-200x200.webp "Onset HOBO RG3 [RG3] Data Logging Rain Gauge")
![Onset HOBO U20 [U20-001-01] Freshwater Water Level Data Logger, 0 to 9 m (0 to 30 ft)](image/cache/wp/gj/Products/Hobo_U20-001-01-200x200.webp "Onset HOBO U20 [U20-001-01] Freshwater Water Level Data Logger, 0 to 9 m (0 to 30 ft)")
![Onset HOBO U20 [U20-001-01] Freshwater Water Level Data Logger, 0 to 9 m (0 to 30 ft)](image/cache/wp/gj/Products/Hobo_U20-1-200x200.webp "Onset HOBO U20 [U20-001-01] Freshwater Water Level Data Logger, 0 to 9 m (0 to 30 ft)")
![Onset HOBO U20 [U20-001-02] Freshwater Water Level Data Logger 0-30 m (0-100 ft)](image/cache/wp/gj/Products/Hobo_U20-001-02-200x200.webp "Onset HOBO U20 [U20-001-02] Freshwater Water Level Data Logger 0-30 m (0-100 ft)")
![Onset HOBO U20 [U20-001-03] Freshwater Water Level Data Logger 0-76 m (0-250 ft)](image/cache/wp/gj/Products/Hobo_U20-001-03-200x200.webp "Onset HOBO U20 [U20-001-03] Freshwater Water Level Data Logger 0-76 m (0-250 ft)")
![Onset HOBO U20 [U20-001-04] Freshwater Water Level Data Logger 0-4 m (0-13 ft)](image/cache/wp/gj/Products/Hobo_U20-001-04-200x200.webp "Onset HOBO U20 [U20-001-04] Freshwater Water Level Data Logger 0-4 m (0-13 ft)")
![Onset HOBO U20 [U20-001-01-Ti] Titanium Saltwater Water Level Data Logger, 0 to 9 m (0 to 30 ft)](image/cache/wp/gj/Products/Hobo_U20-001-01-Ti-200x200.webp "Onset HOBO U20 [U20-001-01-Ti] Titanium Saltwater Water Level Data Logger, 0 to 9 m (0 to 30 ft)")
![Onset HOBO U20 [U20-001-02-Ti] Titanium Saltwater Water Level Data Logger, 0-30 m (0-100 ft)](image/cache/wp/gj/Products/Hobo_U20-001-02-Ti-200x200.webp "Onset HOBO U20 [U20-001-02-Ti] Titanium Saltwater Water Level Data Logger, 0-30 m (0-100 ft)")
![Onset HOBO BHW-PRO [BHW-PRO-CD] HOBOware PRO v.3.x for PC & Mac](image/cache/wp/gj/Products/Hobo_BHW-PRO-CD-200x200.webp "Onset HOBO BHW-PRO [BHW-PRO-CD] HOBOware PRO v.3.x for PC & Mac")
