Sper Scientific Pocket Laser Power Meter # 840011, retail $240.50 (www.sperdirect.com...)
Manufactured by Sper Scientific (www.sperscientific.com)
Last updated 11-15-09

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 1W (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 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: 00-00-00

    MANUFACTURER: Sper Scientific
    PRODUCT TYPE: Laser power meter
    No. OF LAMPS: N/A
    CASE MATERIAL: Plastic
    BEZEL: N/A
    BATTERY: 2x SR44 silver oxide button cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    ACCESSORIES: Batteries
    WARRANTY: 5 years


    Star Rating

Sper Scientific Pocket Laser Power Meter # 840011 * www.sperdirect.com...

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