Gaqqee Mini OLED Voltmeter DC 5–30V & Temperature Meter

Gaqqee Mini OLED Digital Voltmeter & Temperature Meter — DC 5–30V with NTC Probe

Monitor voltage and temperature simultaneously with this ultra-compact Gaqqee Mini OLED Digital Voltmeter. Featuring a crisp 0.77-inch OLED display and a 12-bit high-precision ADC, it delivers accurate, real-time readings in a sleek 30 × 11.9 × 4.2 mm form factor — perfect for DIY builds, embedded systems, adjustable power supplies, and vehicle battery monitoring.

Made in Mainland China.

Key Features

• Dual-Display Convenience: Shows DC voltage (0–30 V) and temperature (0–99 °C) at the same time for real-time tracking of both parameters.
• High-Precision Measurement: 12-bit ADC sampling with ±0.009 accuracy class and a fast ~250 samples/second sampling rate ensures reliable, low-error readings.
• Vivid OLED Screen: 0.77-inch OLED display with 128 × 64 resolution provides bright, clear readouts even in low-light environments.
• Ultra-Compact Profile: At just 30 × 11.9 × 4.2 mm, it integrates seamlessly into tight spaces, enclosures, and embedded panels.
• Wide Compatibility: Operates on DC 5–30 V; usable directly in 5–24 V systems without an external voltage regulator.
• Reverse-Polarity Tolerant: Will not be damaged if the positive and negative power supply terminals are accidentally reversed — added peace of mind during wiring.
• CE, RoHS & WEEE Certified for your confidence in quality and compliance.

Technical Specifications

Wiring Guide

• Yellow wire: Voltage sampling input
• Red wire: Power supply positive terminal (+)
• Black wire: Power supply negative terminal (−)

No external voltage regulator needed for 5–24 V systems. The meter is also protected against accidental reversal of power supply polarity.

Ideal Applications

• DIY electronics modifications and custom builds
• Adjustable power supply output voltage display
• Industrial control equipment monitoring
• Sensor power supply voltage detection
• Vehicle and battery voltage monitoring
• Embedded system panels and enclosures

Package Contents

• 1 × Mini OLED Digital Voltmeter & Temperature Meter (NTC probe included)

You May Also Like

Explore more products from our store:

• Ancient Nutrition Multi Collagen Advanced Muscle 60 Capsules
• B&U 29mm Sinking Minnow Jerkbait Lure – Bass Trout Pike
• B&U Soft Crawfish Bass Lure – Salted Craw Bait 5 Pack

Learn more: OSHA on eye and face protection

Frequently Asked Questions

Q: What voltage range can this OLED digital voltmeter measure?

A: The Gaqqee mini digital voltmeter measures DC voltages from 0 to 30 V, with an operating input voltage of DC 5–30 V. It can be used directly in 5–24 V systems without requiring an external voltage regulator.

Q: Does the voltmeter also measure temperature, and what probe does it use?

A: Yes — it includes an NTC (Negative Temperature Coefficient) probe that measures ambient or contact temperature in the range of 0–99 °C, displayed simultaneously alongside the voltage reading on the OLED screen.

Q: How accurate is this mini voltmeter, and how fast does it sample?

A: The voltmeter uses a 12-bit high-precision ADC with an accuracy class of ±0.009 and a sampling rate of approximately 250 readings per second, ensuring highly responsive and reliable voltage and temperature data.

Q: Is this voltmeter protected against incorrect wiring?

A: Yes. The device is designed to withstand accidental reversal of the positive and negative power supply terminals without sustaining damage, making it forgiving and beginner-friendly for DIY installations.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.