Amazon.com: Phoncoo BC547+ BC557 Each 100pcs All 200pcs Bag BC547B BC557B NPN PNP Transistor TO-92 Power Triode Transistor Bag : Industrial & Scientific
Amazon.co.jp: Electrical Tester Multipurpose Transistor ESR / SMD Tester B Side ESR02PRO Smart Diode Triode Capacity Resistance Meter LCD Meter MOS / PNPN Test HZ Tester (Color : ESR02PRO Test Clip) :