Product Usage
 
Instruction for Operation: (Please refer to the accompanying manual for detailed operation).

Notes: 1. Avoid using in conditions of rain, moisture, high or low temperatures, etc. (Operating temperature: 0°C - 50°C; Storage temperature: -20°C - 70°C).
2. Avoid contact with corrosive substances such as perfume, alcohol, cleaning agents;

3. Avoid using the compass in areas that may affect its normal directional indication:
A、 Near concrete/steel structures such as buildings
B、Very close to the power plant
C、Near household appliances (such as computers, TVs, VCDs, fax machines, loudspeakers, etc.)
D、Nearby a large bridge made of steel or metal
E、在正在行驶的交通工具（汽车、火车、飞机）离很近
F、Near or placed on the surface of the metal plate

Some explanations about an electronic altimeter:

1. This principle is to measure the height difference by sensing the change in atmospheric pressure using a sensor. It requires batteries.

2. At the same location, the barometric pressure can change under different weather conditions (such as clear days and rainy days), or at different times of the day (e.g., morning and evening). As long as the pressure changes, the displayed height value will also change. (For example, if the zero point is placed on the table at noon, but the height displayed at night is 3 meters, this is the reason.)

3. Can you display the altitude value here? Answer: I can't directly display it. You need to have a place with an absolute altitude value as a reference. (For example, if there is a place marked with an altitude of 20 meters, you correct it to 20 meters at that height, and then go to the floor where you are, you can display the absolute altitude value.

4. Is the calibration done a month ago still accurate now? It's likely not, as the reason is mentioned in point 2.

5. I corrected it in Beijing, is it useful to go to Tibet? It is very likely that it will not be accurate, and the reason is also the second point.

How to judge if the device is accurate? The simplest way is to reset it at the bottom floor, then start climbing the stairs. As you climb, the height will change. It's best to take the elevator and watch the number jump continuously, although there may be a few seconds of delay sometimes.

7. Make sure to replace the battery with a good pair. Many errors or malfunctions in function are often caused by poor battery performance.

For example: The shopkeeper lives on the 5th floor. When the meter at the first floor is reset, he goes up to the 5th floor, and the display shows a height of 13 meters. By measuring the altitude using GPS, it is found to be 213 meters. After correction, when he reaches the 5th floor, the display shows the altitude as 226 meters.

Product Usage

 
Instruction for Operation: (Please refer to the accompanying manual for detailed operation).

Notes: 1. Avoid using in conditions of rain, moisture, high or low temperatures, etc. (Operating temperature: 0°C - 50°C; Storage temperature: -20°C - 70°C).
2. Avoid contact with corrosive substances such as perfume, alcohol, cleaning agents;

3. Avoid using the compass in areas that may affect its normal directional indication:
A、 Near concrete/steel structures such as buildings
B、Very close to the power plant
C、Near household appliances (such as computers, TVs, VCDs, fax machines, loudspeakers, etc.)
D、Nearby a large bridge made of steel or metal
E、在正在行驶的交通工具（汽车、火车、飞机）离很近
F、Near or placed on the surface of the metal plate

Before placing an order, I hope everyone can carefully read the introduction of the baby, including the principle of barometer height measurement, understand the basic knowledge of barometric pressure, and the true reason for the error in height measurement due to barometric pressure changes. The error of the altimeter is about 1% after excluding the impact of barometric pressure changes.
The fluctuation of height data at the same location is normal and caused by changes in atmospheric pressure, not by product instability.