Digital Multimeter 4000 Count Tester AC DC Voltage Current Test Gauge Meter Electric Resistance Detector Handheld Tool - AliExpress
5Pcs CD4011UBE 4011 IC NAND Gate, CD4011, 2 Input, 6.8 mA, 3 V to 18 V,
CD4011 NAND Gate Flasher - YouTube
Inductance and capacitance meter adapter for DVM
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5Pcs CD4011UBE 4011 IC NAND Gate, CD4011, 2 Input, 6.8 mA, 3 V to 18 V, DIP-14