Different from any prior line drawing or printing work, once line generation work is processing at quite long work distance, it should be a quite efficient job to operate a high density beam emitting device, such as a 445nm blue laser line generator. It projects moderate brightness blue laser light directly from a 445nm blue laser diode. For the most important of all, owing to the special use of a separate crystal lens with wide fan angles and unique use of thermal emitting system, this durable structure made 445nm blue laser module just brings users easy reaching, high fineness and long lasting line projection for all precise machinery processing works. The usual use of a 445nm blue laser line generator is always working for a quite long time, while still has to work with stable and reliable line projection in long lasting use. It applies an import 445nm blue laser diode within 50mW to 100mW as beam emitting source. In practical precise line positioning work, it is configured with a highly durable anodized aluminum alloy housing tube. It is bearing wide range operating temperature. Once 445nm blue laser module is pointing under multiple working environments, even though it is pointing under mechanical moving, shocking or calibration etc, it still maintains its stable and reliable blue line projection for both of long lasting and long distance use. On condition that 445nm blue laser line generator gets the most advanced use of a separate crystal lens, once it is pointing at a quite long work distance, it still gets the highest level of accuracy line projection as expected. It is working well with non Gaussian distribution blue laser light source emission. No matter it is pointing at close or long distance, it gets the same line brightness from the middle part towards both ends, without any worrying about laser light decay or dim in continuous use. In a large variety of industrial and high tech precise line positioning work, after basic use of desired output power and optic lens fan angle, this 445nm blue laser module is able to make quite satisfied line positioning results for all labs, institutes and colleges etc. Usually within the maximum installed distance of 3 meters, this ultra compact size tube made 445nm blue laser line generator enables the most convenient installation, and the easiest reaching of blue line indication in constant use. It makes sure of no mistake line projection, without any limitation by long distance, high height and hard reaching places etc. Whenever blue alignment laser gets correct use of output power, only after high attention to potential thermal energy hurt to eyes and proper wearing of laser safety goggles, it just makes easy and free line generation in long lasting use.