Qiaoba Laser Diode Module 650nm 5mw Red Laser Diodes 2Pack (Line)

Purchased for and project, and work well. Good quality and price

Found the single line versions to be very bright, when testing at 3.3V supplied from an MB102 breadboard module. I attached Dupont connectors to the thin wires, which were plugged into the breadboard. The laser line output angle is close to 120 degrees. I could collimate the beam with the focus ring to produce a line width of ~4 mm at 5.5 meters, against a white wall. The line was still clearly visible in daylight, in a room without direct sunlight and two small windows. Of course, at shorter distances the lines were finer and much brighter. I was able to power both lasers in a parallel configuration from the MB102. I could see both lines at 5.5 meters. The 5.5 m distance is not necessarily the maximum to see the lines. The limit was the room size. In a very bright room with sunlight, at 5.5 m, it would be marginable to see the beam lines.

These are really nicely built. They arent dinky laser modules like those in a cheap laser pointer... they are quite heavy! The only drawback it that they are only 5mw so are quite dim (why 4 not 5 stars).

The ends have a little distortion, but only about 3/4 inch on each side when 12 inches wide. One thing to note, if you take the lens off, you will see that the laser is putting out a rectangle, not a spot, so not only do you need to focus the lens, but you will see that only in one orientation of the laser body will the line be the thinnest it can be. Since the lens rotates with the focus, the focus is only accurate to 1/2 of a turn of the focus ring. So to keep the focus as tight as possible when rotating the line, you need to turn the whole body, not just the focus ring.

Very bright, focus ring leaves a lot to be desired. Fine lines cannot be achieved. Works ok for the application. Quite inexpensive.

Perfect solution for my machine embroidery placement. Just connect to battery box and secure to my work lamp. Cross lines make positioning embroidery easy. I saw a YouTube video and got the idea from that.

Lasers are useless when they can't be or do not have any focus. This unit falls under the useless category.

Justo lo que pedí

I haven't used these in my project yet; but I have given them a quick test and they seem to work fine. Solid metal jacket, high output, and an excellent focus ring. Quick delivery, and a good price.

got two line lasers as ordered. 3-piece housing is solid. front pieces was lose but that is necessary to adjust it, to get sharp and bright line. with lense unscrewed about 1.5mm it got really sharp and consequently brighter. if it is not focused, it will be dim since the light spreads too much. product is described as using 3V power... it start emitting at 2.2V and draws 19mA, at 3V still draws 19mA. at 3.7V draws 15mA, at 5V it draws 15mA and it does not get warm. i pushed it to 10V and saw no issues (works, does not get hot), did not try to go beyond that 3-9V range allows for plenty of supply options.

Works well as described. I dIY’d this for a drill set-up and served my needs as expected.

I ordered this product in a quantity of two, meaning the same item twice in one order, but I received two different lasers in terms of shape, appearance, and functionality. I am giving 5 stars because for my project, both the first and the second are equally perfect, and they both work as they should. However, the larger one has a different casing and a focusing ring, which I do not see on the smaller laser. It might also have it, but without the stiffening ribs. In general, if size matters to you, it might be worth notifying the seller before or immediately after purchasing these lasers. The photos even show that this is a product with the same barcode.

Useful for small-distance projects only. Anything over 2 feet it's not reliable