- First ask others about the strenght, believe their subjective effects more than supposed micrograms I would say unless it was legitimately lab tested (only in a few countries).
- If you are not able to find out, take the advice from freehugs - I totally agree. Only take one even if they are possibly not extremely strong. 2 doses of what they are 'supposed to be', which is near 80-100 ug would be too much for a first time and taking that into account you should test it out easily first.
You have 3 hits! So you can do one first and then some other time you can do two if you feel confident.
A friend of mine has taken this approach and while he found the mild acid effects pretty much what he expected (the lucidity etc) it was a good introduction for him and a good way to start, now he can do more the next time. And that was off 1/2 blotter of mine, around 100 ug per hit.