Reliability has strong relation with consistency. In statistic, reliable instrument will give the same result from the same sample characteristic. Reliable product gives same capability at every situation, regardless external factor. In engineering, reliable machinery do not have to put on control every time. Machine creates similar things over and over again. Laser level is a part of engineering field. It is device to project laser beam from one source to another point. Engineer uses this device to make precision cutting on material. Builders pick advantage of precision line from laser level to adjust the floor and wall.
Finding reliable product in laser level is not difficult. For reference, most of engineering tools have passed high-quality control before going to the market. There is reliable best laser level to assist your work. To make it simple, laser level will be divided into two sections. Firstly is advanced category for complicated work. It takes expert to operate this tool. One reliable product in this category is Dewalt DW088K. From this device, you can project two lines, vertical and horizontal. It has more brightness to give more visibility on tight space. Dewalt has been on this field since long time ago. Several of products are very reliable to do any task, from simple to more advance.
In home category, Black & Decker BDL170 is very good choice. The design is simple and compact. You can put it inside the bag and bring it anywhere to use anytime. As laser level, this product exhausts vertical and horizontal simultaneously with ultimate precision. To save energy, you only need battery to operate this device. Other specs are rubber protection, backlit for visibility, and wall mounted feature. Another good product in this category is Bosch GTL2. It is for creating perpendicular line on home task. You just push single button to make this device ready to use.