- 1). Insert the included sponge into water to wet it, and insert the sponge into the calibration chamber located at the side of the unit.
- 2). Press the "On/Off" button on the front of the unit to turn the unit on.
- 3). Press the "Mode" button on the front of the unit repeatedly until "mg/L" is displayed on screen.
- 4). Wait approximately 15 minutes for the readings to stabilize. They will then be displayed on screen.
- 5). Locate the "Up" and "Down" arrow buttons on the front of the unit, and use two fingers to press the buttons at the same time and then release them. You will then be prompted to enter the altitude of your location in feet.
- 6). Use the arrow keys to increase or decrease the altitude until you have entered the right altitude.
- 7). Press the "Enter" button, and the unit will be calibrated. The calibration value will be displayed in the lower-right portion of the screen.
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