LCR tweezers are handheld devices for testing Surface Mount Devices (SMD), automatically identifying and measuring Resistance (R), Capacitance (C), and Inductance (L), along with ESR, functioning like a portable LCR meter with different types categorized by features like accuracy (e.g., 0.2% vs. 0.5%), connectivity (Bluetooth), tips (bent, gold-plated), and specific models like LCR-Reader and Smart Tweezers, FNIRSI LCR-ST1, and LCR-Reader Smart Tweezers Bent Probes.