What should I pay attention to when choosing a QR code reader?

Now, when you enter and exit some important occasions, you can use the mobile phone to scan the QR code. This system is called the QR code access control system. In order to realize this door opening method, you must also match certain Hardware devices, including QR code readers, if you want to set up such a complete access control system, you must use a QR code reader, what issues should you pay attention to when choosing?
First, after-sales maintenance issues
For the QR code reader, this is a high-tech access control product that incorporates a high level of technology, so in this case, in the event of a malfunction or other problem, there is no outsider. The method to repair, only to find a professional talent to be able to repair the fault in time, so as to ensure its normal use, so when choosing this card reader, you must look at what after-sales service can the manufacturer provide? If their after-sales service is relatively complete and timely, then such a QR code reader is generally worth choosing!
Second, the reaction speed
Many people want to be able to find a mobile phone that responds faster when they buy a mobile phone, because this mobile phone can get a better experience when it is used. For a QR code reader, Its response speed requirement should be higher, because in some important occasions, there are many people entering and leaving every day, and even there may be a need to queue up for access control. If his reaction rate is slow, it will seriously affect people's Travel speed, such as in the subway station, so when choosing, you should also choose those readers that respond faster!
In many access control systems, this kind of two-dimensional code reader is needed. Through the application of this device, people can provide security for people, so its application will become more and more extensive, but it also needs to reach a certain level. The technical standards can play its functions and functions!
QR code access control speed

Mo2GeC

Appearance: black powder
CAS:
Element: Mo, Ge, C
Purity: by X-ray result
Molecular Weight: 276.53
Apparent Density (g/cm3): ---

Storage: dry seal preservation below 50 ℃.
Do not use if cap seal is broken.
Keep out of reach of children.


[Product Description] : Gallium molybdenum carbide ceramic powder is prepared by sintering Mo, Ga, C powder mixture by high temperature plasma, after mechanical crushing and inert gas grinding.


[Packaging specifications] : fixed packaging 5/10/25/50/100g, or according to customer requirements for packaging;

[Intended use] : used for chemical etching to prepare MXenes, physical and chemical experimental research needs;

[ Basic Information ] :

1. Chemical formula: Mo2Ga2C

2. Constituent elements: Mo, Ga, C

3. Molecular weight: 343.37

4. Chemical status: particles of micro and nano size

5. Appearance and character: dark brown particles with micro and nano size

[Product performance indicators] :

1. Crystal structure: Hexagonal, P63/ MMC [194]

2. Cell parameters:

A = A, B = A, C = A;

α=, β=, γ=;

3. PDF No.: (refer to International Diffraction Data Center PDF-2004 database);

4. Density :(g/cm3);

5. The boiling point:

6. Melting point:

7. Flash point: meaningless;

8. Purity: --;

[Storage conditions and validity]

This product should be stored in room temperature and dry place, avoid contact with acid, alkali and other liquids, long-term storage will happen slow oxidation.

[ Test Method ]

This product can be confirmed by X-ray powder diffractometer crystal results; Element composition was confirmed by energy dispersive X-ray detector. The same morphology characterization was used to characterize the particle morphology. The particle size distribution was evaluated by laser particle size analyzer.



[Safety protection]

1. Health hazards

Hazardous category: Non-hazardous chemical chemical category: ceramic powder;

Route of invasion: inhalation, ingestion;

Health hazards: dust in the eye has irritation, oral stimulation of gastrointestinal tract;

2. First aid measures

Skin contact: Remove contaminated clothing and rinse skin thoroughly with running water.

Eye contact: lift eyelid and rinse with plenty of running water or normal saline for at least 15 minutes;

Inhalation: Get away from the scene to fresh air quickly;

Ingestion: drink enough warm boiled water, induce vomiting, seek medical advice;

3. Ignition and explosion characteristics and fire protection

Flammability: non-flammable;

Mo2Gec Powder,High Density Mo2Gec,Mo2Gec Black Powder,Research Experiment Mo2Gec Powder

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