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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

Narrow Field-of-View Sky Quality Meter with lens.

Sky Quality Meter

SQM

An affordable 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.
 

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.

Magnetometer

Magnetometer

This project measures slight changes in the Earth's magnetic field. These changes are useful for determining the occurence of Aurora/Astralis Borealis.
4 to 20mA utility

4to20mA Utility

This calculator helps determine various values related to 4 to 20mA conversions used in PLCs and instrumentation. FREE / Open  Source.
Physio Timer

physiotimer

Physio Therapy Timer
A timer for physiotherapy exercises. Open  Source.
Grocget

grocget

Grocery Getter Helper
This program will enable you to shop for groceries much faster.
I originally needed something like this many years ago but did not have the tools to program it for Windows, so I found something close to it written by someone else and used that until I found the tools to write my program for Linux. 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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