Quantity   Component name
1 × Aluminum Case https://www.ebay.com/itm/255891214701
1 × 5-Digit DC 0-4.3V Digital Voltmeter https://www.ebay.com/itm/222362829217?var=521228903043
1 × 5mm Red/Green Common Anode LED N500TGLR2D https://www.ebay.com/itm/333879929776
1 × C&K 7101 Series Switch, eg. 7101SPYCB7E https://www.ebay.com/itm/385204174622
1 × 3xAA Battery Holder https://www.ebay.com/itm/163846831045?var=463412665008
6 × Banana Binding Post, various, e.g. Sato T-45 series https://marvac.com/collections/banana-plugs-and-jacks/products/sato-parts-t-45-r-grey-with-red-tip-female-banana-wire-binding-post
1 × 1/4W 1% Metal Film Resistors, various https://www.ebay.com/itm/324690471816
2 × 24Ω 1/4W ±50ppm/°K Resistor https://www.digikey.com/en/products/detail/stackpole-electronics-inc/RNMF14FTC24R0/2617320
1 × Capacitors, various
1 × 10kΩ COPAL Panel-Mount Trimpot https://www.ebay.com/itm/334308380659
1 × 50kΩ COPAL Panel-Mount Trimpot https://www.ebay.com/itm/384066015800
1 × KT815G PNP TO-126 ECB pinout transistor https://www.ebay.com/itm/253585236855
2 × 2N3904 NPN Transistor
1 × 2N3906 PNP Transistor
1 × LM385Z-1.2 or LM385Z-ADJ Reference https://www.digikey.com/en/products/detail/onsemi/LM385Z-1-2G/918525
1 × LM393 Dual Comparator https://www.digikey.com/en/products/detail/texas-instruments/LM393PE3/2596857
2 × LM2904 Dual General-Purpose Op-Amp https://www.digikey.com/en/products/detail/texas-instruments/LM2904P/379712
1 × Useco 1390D-8 Minuature Hollow Turret Terminal https://www.ebay.com/itm/252619147137
1 × Calibration Resistor Set https://www.ebay.com/itm/145033361411
1 × Kelvin Clips https://www.ebay.com/itm/295607215539