Unihedron


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Portable Tools for Physics and Astronomy:

Sky Quality Meter - Connected models:

SQM-LU

USB connected Sky Quality Meter with narrow Field-of-View

SQM-LU-DL

Datalogging Sky Quality Meter with narrow Field-of-View

SQM-LE

Ethernet connected Sky Quality Meter with narrow Field-of-View

SQM-LR

RS232 connected Sky Quality Meter with narrow Field-of-View

Outdoor housing

Weatherproofing for the connected Sky Quality Meter

Sky Quality Meter - Handheld models:

SQM-L

The standard Narrow Field-of-View Sky Quality Meter with lens

SQM-Classic

A wide angle meter for measuring sky brightness for astronomers

Miscellaneous:

Nu-B

Narrow-band low-cost spectral light source.

$Diffraction grating$

Diffraction grating

This diffraction grating is a standard diffraction grating used to separate white light into its spectrum.

CapSelector

The Unihedron CapSelector provides an inexpensive way to tune a VLF loop over a wide range (120 - 5510 pF) of capacitances. It replaces expensive and bulky high-value variable capacitors or decade capacitor banks. It is a passive device and therefore requires no power.

Posters:

Electromagnetic Radiation Spectrum poster

This poster includes all known ranges of EMR including brain waves, communication frequencies, microwave background radiation, etc, as well as the audio spectrum, all organized by octaves.

Pi poster

Upon closer examination, 350,390 digits of pi are visible. The most commonly recognized digits are visible from a distance.

Primes poster

Upon closer examination, 54,222 primes are visible. The first 122 prime numbers are visible from a distance.

e poster

Upon closer examination, 350,390 digits of e are visible. The most commonly recognized digits are visible from a distance.

Phi poster

Phi, the golden ratio. Upon closer examination, 350,389 primes are visible. The first 439 digits are visible from a distance.

Root 2 poster

Square root of 2, Pythagoras' constant.

This poster shows the Square root of 2 (Pythagoras' constant) in decimal to many places. Upon closer examination 350,389 digits of the Square root of 2 are visible. Each line contains 600 digits. The first 439 digits are visible from a distance.

Open Source:

gonvert

A very complete Unit Conversion Utility that runs on Linux and Windows. All units in a category get converted while you type. FREE / Open Source.

saydate

A Linux shell program that says the date. Simply type saydate and the program speaks the actual date (e.g. "the date is thursday november the twenty-fifth nineteen-ninety-nine").
saydate home. FREE / Open Source.

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