First, the function keys Description:

1. ON / OFF: Digital Level switch ammonium key.

2. Audio cues key: When the horizontal scale and 90 ° to 0 ° time it will give voice prompts. Press this key to turn on or off the sound of the prompts.

3. Calibration key: the plane in less than 3 ° 0 ° standard on reset, if the plane more than 3 °, the button will not work.

Calibration methods: the horizontal ruler in a less than 3 ° of the plane (you can compare and Level), wait 10 seconds. Then press the calibration button, the display will show CAL1. Digital spirit level to turn 180 °, and then wait 10 seconds, and then click the calibration button, the display will show CAL2, about 5 seconds, the display will again show the angle of the measurement results. If this plane more than 3 ° of the angle, the button will not work. If you push the calibration at this time, it only shows “–”。 3 seconds, it will return to the original angle measurement mode.

4. Mode keys: the digital spirit level there are three angle measurement mode, Press this key to achieving the mutual conversion of different modes.

(1) angle measurement mode: that the absolute angle measurement. That the measured angle and the absolute level of the surface angle “0 °” values.

Measurement methods of operation:  the horizontal ruler put away, and then select the angle measurement mode, press the top immediately after the display shows “DEG”. Rotary spirit level, can read the value of the absolute angle measurement.

(2) Percentage% mode: the angle corresponding to the right angle, said side edge with another right-angle corner cutting the percentage of positive values. For example: tgα = a / b

Measurement methods of operation: the horizontal ruler put away, and then select the percentage of the% measurement mode, then, immediately above the display shows “%.” Rotary spirit level, to be read out tgα measurement values.

(3) the relative angle mode:  that has been in a dip on the surface, to measure the surface relative to the original value when the relative angle to use this mode.

Measurement methods of operation:  the horizontal ruler when he said, and then select the relative angle measurement mode, when the display starts flashing “0.0″, shows the top also shows “DEG”. Turn the digital spirit level, then shows the angle relative to the original surface of a dip angle.

Regardless of any mode, the display value at the same time, the display of the left and right sides also show the measured corresponding to a higher plane of the side “▲” and the lower side “▼ “, given the appropriate prompt. And with the increase of the angle display showing the location of different heights.

5. Maintain the data button: Press this button, you can just measure to keep the number of mobile foot level, the data does not change.

Second, Hibill digital spirit level technical features: