The Piranha Red Laser Pointer, retail $3.75 (www.alpec.com...)
Manufactured by (Unknown) for Tracer (www.tracer.net
Last updated 12-02-12
What this is is a keychain laser pointer. It emits a red beam (est. 645nm-650nm) with at least 2.5mW of output power, and it includes the 3 LR44 button cells it feeds from.
It fits on your keychain with a split-ring, so you can carry it anywhere.
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To use your new laser pointer, feed it first (see below), and then you'll be ready to go to town.
Press the button on the barrel and hold it down for as long as you want or need the laser beam, and release it to shut the unit back off.
Don't aim the laser at your face when you push the button, otherwise you might hit yourself in the eyes with the laser beam, and that wouldn't be very good at all.
This laser pointer requires three LR44 button cells, which are included in the package so you don't need to run to the store right away. To change them, unscrew and remove the tailpiece, dash it to the floor, and stomp on it...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead.
Tip the open end of the laser pointer into your hand, and dispose of or recycle the three button cells that come out as you see fit.
Stack three new LR44 button cells on top of one another on a table, countertop, or other flat surface, button-end (-) negative facing up. Lower the laser pointer over this stack so all three cells are in the barrel. Slide the assembly to the edge of whatever surface you're reloading the pointer on, and place your finger over the laser pointer's opening as you slide it over the edge, so all those batteries don't just clatter to the floor. Invert (flip over) the laser pointer now, so the open end of the barrel faces up. Remove your finger. Screw the tailpiece back on, and be done with it.
Aren't you glad you didn't stomp on that tailpiece now?
Unable to measure current draw due to how the product was constructed.
As inexpensive laser pointers go, this laser pointer is built relatively sturdily. It is not water-resistant or submersible, and probably would not withstand being stomped on or run over either. But it should not break just hanging on your keychain.
Since laser pointers like this are not meant to be stomped on, run over, drowned in the commode, or otherwise abused, I will not inflict those sorts of punishments upon this one. So this section of the web page will be a bit on the bare side. :-/
The laser pointer emits a red beam at approximately 653nm to 658nm in wavelength in the red part of the spectrum, and has a measured output power of 2.67mW. The labelling on the laser pointer indicates it is a CDRH Class IIIa device (which cannot emit more than 5mW), so there is no problem whatsoever with that.
This is a directly-injected diode laser, so there are no crystals, filters, electronic drivers, or other horse puckey inside to go afoul.
Beam photograph on the test target at 12".
Beam image bloomed *substantially* in this photograph.
Power output measures 2.67mW on a meter designed specifically for this purpose.
Spectrographic analysis of this laser; newer spectrometer software & settings used.
Spectrographic analysis of this laser; spectrometer's response narrowed to a band between 640nm and 660nm to pinpoint wavelength.
Spectrographic analysis of this laser; yet newer spectrometer software & settings used.
Spectrographic analysis of this laser; spectrometer's response narrowed to a band between 650nm and 660nm to pinpoint wavelength, which is 665.770nm.
Spectrographic analysis of this laser below lasing threshold.
Spectrographic analysis of the laser diode in this laser; newest (03-25-12) spectrometer software & settings used.
Spectrographic analysis of the laser diode in this laser; spectrometer's response narrowed to a band between 650nm and 655nm to pinpoint wavelength, which is 656.409nm.
TEST NOTES:
Test sample was purchased for me by a member of Candlepower Forums, and was received late on the morning of 02-24-06.
The website this product is sold on requires one to have a bank card in order to make purchases; since I do not have one, somebody else ordered the laser pointer for me.
This product was made in Hong Kong. A product's country of origin really does matter to some people, which is why I published it on this web page.
UPDATE: 02-25-06
When the beam was examined very closely, no artifacts were seen in it. For $3.75, you really couldn't ask for a higher beam quality.
UPDATE: 03-11-06
Spectrographic analysis of the Piranha laser pointer.
PROS:
Clean beam with no artifacts (splotches, rays, rings, or other evil little things) in it
Reasonably sturdy construction
Nice looking black body
CONS:
Uses batteries that can be difficult to find or locally expen$ive
MANUFACTURER: Unknown
PRODUCT TYPE: Keychain laser pointer
LAMP TYPE: Directly-injected diode laser
No. OF LAMPS: 1
BEAM TYPE: Very narrow spot
SWITCH TYPE: Momentary pushbutton on/off on barrel
CASE MATERIAL: Aluminum
BEZEL: Metal; laser inside cell for it
BATTERY: 3xLR44 button cells
CURRENT CONSUMPTION: Unknown/unable to measure
WATER- AND PEE-RESISTANT: Very light splatter-resistance at maximum
SUBMERSIBLE: NO WAY HOZAY!!!
ACCESSORIES: Medium split-ring, 3 batteries
WARRANTY: 6 months
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