When evaluating green laser pointers, the wavelength is critical; most standard green lasers operate at 532nm, which is highly visible to the human eye. You must verify the output power (mW), as this determines the beam's range and brightness. For professional use, look for high-quality DPSS (Diode-Pumped Solid-State) crystals to ensure beam stability and a low divergence rate (<1.5 mrad) to maintain a sharp point over long distances. Additionally, check the battery type (rechargeable 18650 vs. AAA) and the housing material, preferably aerospace-grade aluminum for heat dissipation and durability.