When it comes to stone, it gives a hard, firm and reliable feeling. With its outstanding features, stone has been favored by consumers and is widely used in various decoration and decoration. But under this hard appearance, who would have thought that stone would be sick? The reason is nothing more than the influence of two factors, "inside and outside." Internal Causes of Stone Diseases Structural Structure of Stone: There are micro-cracks and hairs in natural stone. It will absorb fine dust and dirt in the air for a long time, and slowly penetrate into the stone due to capillary action, which greatly reduces the stone. The decorative properties and service life, the smaller the pores, the stronger the capillary action and surface adsorption. Relatively complex chemical composition: Some components in the stone are easy to interact with the external environment, causing erosion or variability of the stone. Stones generally contain iron components to varying degrees, and rust yellowing due to moisture erosion. The higher the iron content in the stone, the higher the rust height is. In addition, most of the natural marble's main components are carbonates, calcium carbonate and magnesium carbonate, as well as a small amount of basic oxides. Calcium carbonate and magnesium carbonate are relatively stable compounds. In a humid environment, they easily react with acidic oxides such as carbon dioxide, sulfur dioxide, sulfur trioxide, nitrogen dioxide in the air, and change the physical structure inside the marble. . Similar chemical damage will occur on other stone materials. Lighter will make the surface of the stone tarnish, and even the color will fade and appear stains; in the case of heavy, the hardness of the natural stone will decrease and the surface will be weathered and peeled off. The external causes of stone lesions affect the decorative effect of the stone and the external causes of the service life, such as improper maintenance during mining and storage and storage; the influence of bonding materials used for installing stone and natural environmental factors. The impact of mining, processing, storage and transportation: such as the crack and mining method of stone is not scientific, the mining method is unscientific, it will greatly increase the probability of stone cracking; the iron tools used in processing may also leave hidden dangers for the rust of the stone, inappropriate The stone coolant will pollute the stone; improper maintenance during storage and transportation will also cause pollution such as rust and grass rope yellow. The effect of the bonding material used for installing the stone: If the wet stone is applied by the cement paste when installing the stone, the alkaline soluble substance in the cement will ooze out along the capillary pores of the stone due to the erosion of the rain, and Alkaline compounds such as Ca(OH)2 will chemically react with CO2 or H2O in the air to form CaCo3 crystallized on the surface of the stone to form a salting-out and pan-alkali phenomenon. In addition, some of the salts formed after the hydration of the cement have the characteristics of a desiccant, and after infiltrating the stone, the moisture in the air is absorbed to form a water spot on the surface of the stone, which seriously affects the appearance. In addition, the use of improper bonding materials, such as some stone glue, will also make the stone yellow. Environmental factors: Environmental factors include environmental pollution, acid rain erosion and freezing damage. Air pollution, acid rain and other man-made pollutants in the natural environment can cause pollution and corrosion to the stone. In addition, freezing damage is also an environmental factor that cannot be ignored. Because the stone is water-absorbing (even if it is used for dry hanging construction), in the cold winter, the weathering process is accelerated by freezing, so that the strength is reduced, which not only affects the use. Life expectancy also threatens personal safety. After the cause of the disease in the stone, we must find ways to prevent the disease and treat the diseased stone. For stones that have already developed lesions, it is necessary to use cleaning, grinding and coloring to control, restore the original appearance, and then do protective treatment, so as to treat both the symptoms and the root causes. Otherwise, the stone lesions will be aggravated until it is weathered, peeled off, etc., and cannot be used.
Measuring Wheel
Measuring wheel also called mechanical ranging car or digital distance measuring wheel.it is widely used to measuring distance in professional surveying and mapping work,road engineering, landscape planning and design,golf course and lanes ect.
The instruction of digital measuring wheel
Please read this instruction before you use the product
Thanks you for choosing our product. This instrument is a new length measuring instrument, it is easy to use,stable and reliable.
The main features:
You could convert the unit between metric and foot; The data could be stored and extracted; The touch switch of the digital measuring wheel is anti-water; The handle which could adjust the height of the instrument is easy to apply. The wheel wrapped with rubber could help to avoid slipping so that the measuring data is more precise.
1.The main parts (From up to down):
Handle
Data display panel
Battery cover
Handle lock
Measuring wheel
Kickstand
2. Technical data:
A. It could measure up to 99999.9m/ft.
B. Accuracy:+/- 0.3%
C: Minimal display :0.1m
D: Power supply 3V (2xAAA LR003)
E: Suitable temperature for use : -10c°~45c°
3. Button and Operation
CLR: Clearance
SM : Store the data
ON/OFF: Switch
Rm: Extra the data
M/ft: Conversion between metric and foot
Data display panel
Power supply
The stored data
The displayed data
Metric
Foot
1. ON/OFF : Switch.
2. m/ft: it means the conversion between metric and foot. If you select (m), the displayed data is based on metric. If you select (ft) ,the displayed data is based on foot.
3. SM: Store the data. You could save the data that shows on the display panel by pressing this button. It could store 5 records that respectively show on M1, M2,M3, M4, M5.( Refer to Table 1)
Before storing After storing Full of the memory
(Table 1)
4. RM: Extract the stored data from SM. For example, if you have already stored the measuring data 5M as M1, 10M as M2. But now the measuring data is 120.7M, you could press the bottom RM once then the digital display panel will shows the the data of M1. The top right of the display panel shows [R". The data of the digital display panel will return to the present data after two seconds. ( Refer to Table 2). If you press the RM twice, the data of the M2 will show on the display panel, the [R" also is on the top right. The data of the digital display panel will return to the present data again after two seconds.
Present data Press the RM Once After 2 seconds
(Table 2)
Present data Press the RM twice After 2 seconds
(Table 3)
5. CLR: Clearance. Once you press this button, the present data will be deleted.
4.Precautions for use
Please open the handle lock to adjust the suitable height of this instrument at first and then close it before using the instrument. Put away the kickstand and turn on the power. Put the wheel on the road to be measured when the data is 0.0m on the digital display panel. Please press the bottom CLR if you want to delete the present data.
1. Please go straight if you want to measure a straight line to ensure the accuracy of the measurement.
2. Do not measure uneven surfaces because it will reduce the accuracy.
3. Do not measure in the rain for a long time.
4. Do not use the instrument under the high temperature environment or keep this product in the high temperature place.
5. Please open the battery cover by using the cross-head screwdriver and change the battery when the digital display panel is dark.
6. Do not deal with the used batteries by yourself, please send them to the government designated place where to recycle them.
7. Please remove the battery and clean the instrument by use the mild detergent to prevent rust if you haven`t used it for a long time. Then please pack it well and save it in the rough place.
8. Do not use benzene solution to clean the instrument, otherwise its surface will be corroded.
9. Do not use this the instrument as a toy for child for avoiding unnecessary damage.
Measuring Wheel,Measuring Wheel Walking,Wheel Measuring Tool
Wintape Measuring Tape Company , https://www.wintapetape.com