For Building an EOS 1
Item Note Quantity Source/Link
Acrylic sheet 1/8" thick, opaque, for outter housing 1 sheet 12" X 12" McMaster-Carr and other places
sample holder module 3D printed, opaque (gray) 1 Form 2 3D-printer
slit 3D printed, opaque (gray) 1 Form 2 3D-printer
mirror 1" square 1 craft stores, etc
diffraction grating 1000 lines/mm, transmissive 1 Amazon and other places
standoff (spacer) 1/4" OD, 1-1/2" length, female, 10-32 threaded both ends 2 McMaster-Carr and other places
screw 10-32, stainless steel, 3/8" - 5/8" threaded length 2 McMaster-Carr and other places
LED white, 5mm 1 Adafruit and other places
resistor 10 - 100 Ohm ≥1 electronics stores, etc
battery pack 3 AAA battery slots, on-off switch 1 Adafruit or DigiKey
battery AAA, 1.5V 2 electronic stores, department stores, etc
double-sided tape thin, 1/4" - 1/2" wide ∼20 cm craft stores, department stores, etc
Scotch tape thin, 1/4" - 1/2" wide ∼10 cm craft stores, department stores, etc


For Nitrate Tests
Item Note Quantity Source/Link
nitrate test kit API brand, freshwater 1 (good for >100 tests) Amazon and other places
pipette with volume markers, 3mL - 5mL 1 per test Amazon and other places
test tube with volume markers, 3mL - 5mL 1 per test Amazon and other places
cuvette optically transparent, standard, 3.5mL 1 per test + 1 reusable (reference) Amazon and other places