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Portable Tools for Physics and Astronomy:

Sky Quality Meter - Connected models:

Sky Quality Meter-LU

SQM-LU

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

Sky Quality Meter-LU-DL

SQM-LU-DL

Datalogging Sky Quality Meter with narrow Field-of-View

Sky Quality Meter-LE

SQM-LE

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

Sky Quality Meter-LR

SQM-LR

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

Meter housing

Outdoor housing

Weatherproofing for the connected Sky Quality Meter

Sky Quality Meter - Handheld models:

Sky Quality Meter-L

SQM-L

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

Sky Quality Meter

SQM-Classic

A wide angle meter for measuring sky brightness for astronomers

Miscellaneous:

Nu-B

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.

Capacitor selector

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 spectrum

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

Pi poster

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

Primes poster

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

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 poster

Phi, the golden ratio. Upon closer examination, 350,389 primes are visible. The first 439 digits are visible from a distance.
SQRT2 Poster

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: the Unit conversion utility

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 speaks the date

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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