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The pro battery is a 9V block battery. The battery used for the remote control car handle is the same as that in the market supermarket. The price is not expensive. If you buy a machine + battery, you will only be charged the cost price.

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The characteristics: ultrasonic rangefinder is completely suitable for home decoration, calculating the area volume when buying air conditioners, real estate agents or construction workers, and it is necessary to quickly measure the room and room area, ultrasonic rangefinder can measure linear distance from 0.50m to 18m. (1.5 feet-60 feet) ultrasonic rangefinder is used to transmit ultrasonic waves to the measured object, and then calculate the ultrasonic round trip time to determine the measuring distance.
Product Parameters:
measuring range: 50cm ~ 18 m
Error: about ten thousandths
Resolution: 0.01 m
Maximum measuring distance: 18 meters
Maximum Distance Sum: 180.00 meters
Maximum computing area: 18 × 18 square meters
Maximum calculated volume: 1800.0 cubic meters
Battery: 9v
Transmitting frequency: 40kHz
Accuracy: ± 0.5%
Resolution: 0.01m
Operating temperature: 0°C to 50°C

Export products, English instructions!

Precautions During measurement:

1. The ultrasonic rangefinder tests the distance between the obstacle and the bottom of the machine, not the top distance.

2. When measuring, the fuselage and the wall should be kept vertical as far as possible. Especially when the measured distance is relatively far, the more vertical the measurement data is, the higher the accuracy of the measurement data. On the contrary, the larger the slope, the greater the error. It is recommended to turn on laser positioning for long distance measurement to keep vertical as far as possible.
Follow these steps to install the battery:
1. Put it in the direction of the battery room arrow;
2. The cover is pushed slide open, and there are positive and negative (+ and-) poles in the battery room,
3. Open the lid
4. Replace the battery when the power is low or the range finder cannot run.

Switch using rangefinder: to turn on this instrument, press "MEASURER" the measured measurement:
1. Click "MEASURE", the radar of this instrument will MEASURE that the instrument reaches the other end to be measured.
2. Make the bottom of the instrument close to the wall, which is probably the distance from the ceiling to the floor. Make sure there are no obstacles between the distances you measure, and your head or hands should not be in front of the measuring instrument.
3. Press "FEET" or "METER" repeatedly. "FEET" means measuring in FEET, or "METER" means measuring in meters.

Description:
The display of the measuring instrument is generally about 30 seconds. If you change another mode, it will take about 30 seconds.
If your measurement range is less than 2 feet (0.5 meters) or more than 60 feet (18.288 meters), "ERROR" will be displayed"

Measuring Tips:
some curtains can absorb sound waves, resulting in inaccurate measurement of measuring instruments. If you measure in a room with curtains, please put the curtains on the other side of the window first and close the window.
If there are obstacles in the measured distance, the ultrasonic measured data is incorrect, such as tables, chairs, or other obstacles. If you are not sure whether your measurements are correct, then you can make multiple measurements from different angles.
If you measure not a flat place or a very narrow corner, then your data is incorrect.
If the distance to be measured is greater than 60 feet (18.288 meters), select the point in the middle of the House, for example: measure from the point to each side, and then add up.

To reduce the measurement error:
1. Use measurement to measure a size according to these steps
2. Press the "STORE" button to STORE the measured data in the memory card M1,M2 or M3.
3. Repeat the first and second steps above to store data if necessary.
4. If you want to store data in a memory card, press M1,M2 or M3 card. In this way, the data exists.
5. If you want to store new data, delete the original data directly.
6. If you want to delete ALL data, press "ALL MEMORY CLEAR" and hold it for 3 seconds, then ALL data such as M1,M2 and M3 will disappear temporarily.
Note: The date and sound after deletion cannot be saved.

Measurement of volume:
want test Measure the sound effect of the housing. First measure the height, width, and length, and then store each data to a different memory card. Please see "Saving a Measurement", then press "VOLUME", the calculation and storage of sound effects come out.

The measurement area:
Follow these steps to find two empty buckets:
1. The measured height and width are stored on the memory card of M1 and M2. Press "AREA" "M1" and "M2" to store the data.

Of addition, subtraction, multiplication, and Division storage:
1. Save any two sizes measured in M1 and M2,
2. Press the "ALL MEMORY clear" button
3. Add other data to be added according to "M1" plus "M2" or "M1" minus "M2" minus other data to be added, in this way, the data to be added or reduced will come out.
4. If you want to store additional data or clear the MEMORY, press "ALL MEMORY clear.