Press the button briefly. The LED will flash and the horn may operate briefly depending on mode. The system will power down after 5 minutes.
With the unit on, lower the probe toward the water. When the water is reached, the LED will turn on, and the horn may operate depending on function.
When the unit is turned on, the LED will flash 3 times to indicate good battery status. A single flash indicates that the battery is getting low.
The horn can be loud, very loud, or silent. To enter or leave silent mode on the horn, press the button briefly. To enter or leave very loud mode, press the button twice in rapid succession.
If the water being measured is ultra-pure, the normal setting may not detect the water surface. To enter high sensitivity mode, press and hold the button for 5 seconds. The LED will flash briefly. To exit high sensitivity mode, remove the battery briefly and press and hold the button while re-inserting the battery.