DropOS

Innovative Mini OLED Voltmeter – The Smallest Ever in the Market Upgrade your voltage monitoring with this brand new 0.5-inch ultra-compact OLED digital voltmeter. Designed for space-limited projects, it’s smaller than your finger and replaces traditional bulky digital tubes with modern OLED technology. Key Features The Smallest Ever Design Ultra-thin version: 15×18×3.2mm Regular version: 15×18×4.2mm Tiny body fits almost anywhere – ideal for cars, motorcycles, DIY electronics, and small devices. Innovative OLED Display 0.5-inch high-brightness white OLED screen 3-digit display with automatic decimal point shift Clear and easy to read, much better than old LED digital tubes High Precision Measurement High accuracy: 0.08% Measurement error: ±0.7% Wide measuring range: DC 0–30V Working voltage: DC 3.5–30V Working current: <20mA Refresh rate: 5Hz (default) / 10Hz (short B) 2-Wire & 3-Wire Connection Modes 2-wire mode: Power and measurement share the same input (3.5–30V) 3-wire mode: Independent power supply, supports 0–30V full range measurement Function Configuration Short A: Turn off “V” symbol display Short B: Switch refresh rate from 5Hz to 10Hz Wiring Diagram 2-Wire Connection G → Negative V & V+ → Positive 3-Wire Connection G → Common negative V → Power positive V+ → Measured positive Application Scenarios Car & motorcycle battery monitoring DIY electronics & Arduino projects Power supply testing Battery packs and portable devices Industrial control and small equipment Specifications Display: 0.5 inch OLED white 3-digit Measure range: DC 0–30V Supply voltage: 3.5–30V Accuracy: 0.08% Size: 15×18×3.2mm / 15×18×4.2mm Connection: 2-wire / 3-wire Package Includes 1 × Mini OLED Digital Voltmeter