5Colors*20PCS=100PCS 5mm LED Diode Light Assorted Kit Green Blue White Yellow Red COMPONENT DIY kit|Diodes| - AliExpress
Sharp EL-377WB 10 Digit Professional Handheld Calculator - Zerbee
Diode Current Equation | Electrical4U
LED - Violet 5mm - COM-12704 - SparkFun Electronics
Transistor tester LCR TC full color screen graphic display|Instrument Parts & Accessories| - AliExpress
Amazon.com: CO RODE 3mm and 5mm LED Lights Emitting Diodes Assortment Set Kit for Arduino Bright White Red Blue Green Yellow, 300-Pack : Industrial & Scientific