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6
8
1. ON/OFF button: Press once for ON, Press and hold for OFF.
2. Select FLOW units (L/min or US gpm)
3. Select TEMPERATURE units (°C or °F)
4. Pressure gauge
5. Battery compartment
6. LED indicator (See Section "Service" and "Additional LED indicator fuctions")
7. Digital Display:
7a. Flow display
7b. Temperature display
7c. Service Icon (See Section "Service")
7d. Battery state indicator
7e. Chevrons indicate selected units (refer to buttons)
8. Warranty void sticker
6
OTC 4278A Hydraulic Flow Meter
7a
7c
1
5
2
7e
7d
7b
3
4
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