Several "LM-40" clones exist that use unregulated diode lasers (laser engraving modules crammed into a pen). These do not have temperature feedback and will burn your boards instantly. Ensure your unit has the thermocouple input.
When a pad lifts off an iPhone logic board, you need to scratch the solder mask and solder a tiny jumper wire. The LM-40 can hit a 0.5mm exposed copper trace without melting the mask three millimeters away. Hot air would lift surrounding pads. refox lm-40 mini laser
Here’s an interesting piece of text regarding the (often used in laser engraving): Several "LM-40" clones exist that use unregulated diode
In the fast-paced world of electronics repair, precision is everything. As devices become smaller, denser, and more heat-sensitive, traditional rework methods often fall short. Enter the —a revolutionary tool that is changing the game for professional technicians and hobbyists alike. When a pad lifts off an iPhone logic
English 
Russian 
French 
Spanish 
Korean