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Absolutely the utmost care must always be taken when using a laser both for your safety and the safety of others around you.
I work with a few lasers for work and the more time I spend on them the more care I find is needed handling them.
Joining your local astronomical society will allow you to purchase a fairly decent laser legally.
I will never make or assist people with lasers if I feel they are going to use them incorrectly.
When used appropriately lasers can be a great tool to help.
Any questions please ask me.
Note: any laser over 1mw requires a permit to possess at least in south Australia anyway.
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