SPER SCIENTIFIC LASER POWER METER
Sper Scientific Pocket Laser Power Meter # 840011, retail $273.00 (www.sperdirect.com...)
Manufactured by Sper Scientific (www.sperscientific.com)
Last updated 10-25-19
This product does not emit light of its own (much like this spectrometer and this one), so the standard review format will not be used and the product will be assigned a rating at once. A very high rating too, as during the time I've had it, it has thus far performed flawlessly. 
The Sper Scientific Pocket Laser Power Meter # 840011 (hereinafter, probably referred to as a "Laser Power Meter") is a small, pocket-sized instrument that allows you to measure the power output of pretty much any CW (continuous wave) laser with wavelengths ranging from 400nm (violet) to 1,100nm (near-infrared).
It features a silicon photodetector calibrated to the 632.80nm HeNe (helium neon) laser line, and can measure power output from 1µW (microwatt) to 40.0mW (milliwatts) at that wavelength; though the shorter in wavelength you go, the greater the laser power output you can measure - clear up to 400mW (0.40 watt) at 400nm in the violet part of the visible spectrum.
Accuracy is published at +/-5% @ calibrated wavelength of 633 nm / 1mW.
The unit uses two SR44 silver oxide button cells; since purchasing the product in late-2004 and taking no fewer than a thousand measurements, I have yet to change them!!!
This photograph shows the unit open and activated; as it would be for a measurement.
To take a measurement, open the lid, and turn that large dial near the center of the instrument so that the arrow on it points to the maximum amount of laser power output you expect; if you're not certain, just set it to the 40mW scale -- you can always turn the dial to a lower range during your measurement if necessary.
You'll see a wand connected by a coily black wire, On the face of the wand near the top, you'll see a small black disc. Direct (aim) the laser beam at this disk, and note the reading on the unit's display. Write it down if necessary -- you'll soon see why.
To turn the instrument off, turn the large knob clockwise or counterclockwise until it stops.
On the inner surface of the lid, you'll see a table containing wavelengths (in nanometers) and values that need to be multiplied. Input your laser's wavelength in nanometers (ex. "532" for a green DPSS, "473" for a blue DPSS, etc.) into a calculator, press the "X" key, then look up your laser's wavelength on the lid and input the multiplier value into your calculator. When you press the "=" key on it, your laser's output power in milliwatts will be displayed.
If you're measuring a HeNe laser with a wavelength of 632.8nm (orangish-red), you may omit all of this and obtain your power output value directly from the display on this instrument.
You may "freeze" the laser's minimum or maximum power output values on this instrument by pressing the button on its left side (it looks like a door latch mechanism - but trust me, it's not).
Press and release it once to capture the minimum power output value; press & release it again to capture the maximum power output value; press & release it a third time to place the instrument back in its normal state.
And this is the wavelength multiplier table printed onto the inner surface of the product's lid.
TEST NOTES:
Test unit was purchased on Ebay sometime in late-2004.
Product was made in the United States.
A product's country of origin really does matter to some people, which is why I published it on this web page.
UPDATE: 10-25-19
Product was stolen in Shelton WA. USA while awaiting shipping to me in Fresno CA. USA.
Therefore, the dreadful, "
" icon must be appended to its listings on this website, denoting the fact that some true-blue total asshaberdasher has kyped it -- probably to sell for drug money if who I suspect stole it indeed did it. 
MANUFACTURER: Sper Scientific
PRODUCT TYPE: Laser power meter
LAMP TYPE: N/A
No. OF LAMPS: N/A
BEAM TYPE: N/A
SWITCH TYPE: N/A
CASE MATERIAL: Plastic
BEZEL: N/A
BATTERY: 2x SR44 silver oxide button cells
CURRENT CONSUMPTION: Unknown/unable to measure
WATER RESISTANT: No
SUBMERSIBLE: NO WAY HOZAY!!! 
ACCESSORIES: Batteries
WARRANTY: 5 years
PRODUCT RATING:
Sper Scientific Pocket Laser Power Meter # 840011 * www.sperdirect.com...
Do you manufacture or sell an LED flashlight, task light, utility light, or module of some kind?
Want to see it tested by a real person, under real working conditions? Do you then want to see how your light did? If you have a sample available for this type of
real-world, real-time testing, please contact me at bdf1111@yahoo.com.
Please visit this web page for contact information.
Unsolicited flashlights, LEDs, and other products appearing in the mail are welcome, and it will automatically be assumed that you sent it in order to have it tested and evaluated for this site.
Be sure to include contact info or your company website's URL so visitors here will know where to purchase your product.
This page is a frame from a website.
If you arrived on this page through an outside link,you can get the "full meal deal" by clicking here.