Resistance Reader (Ohmmeter) – Thunder Cloud is an essential and multifunctional tool designed for all rebuildable atomizers (RDA, RTA, RDTA). It combines precise resistance reading with the fire/press function (2 in 1), allowing you to test, stabilize and run your coils with total safety and convenience on a single workspace.

Equipped with a standard 510 connector with a spring pin and multiple electronic protection systems, it operates via an external 18650 battery (not included) — ideal for those seeking precision and safety in coil construction.

⚠️ Measuring/testing device — does not include 18650 battery, atomizers, tools or e-liquids. Keep out of reach of children and pets.

Product Details

• Brand: Thunder Cloud
• Type: Ohms Reader / Resistance Meter (Ohmmeter)
• Functions: Resistance measurement and ignition/heating test (2 in 1)
• Connector: 510 standard spring-adjustable
• Power: 1x 18650 Battery (not included)
• Protections: Multiple integrated circuit protections
• Compatibility: All rebuildable atomizers with 510 thread

Product Advantages

• 2-in-1 design: measures Ohms value and allows pre-warming/stabilizing resistances on the base itself.
• Spring-loaded 510 connector, ensuring excellent contact with virtually any atomizer.
• Multiple circuit protections to ensure a safe assembly process.
• Replaceable 18650 battery, ensuring autonomy and longevity of the equipment.

Contents of the Package

• 1 × Resistance Reader (Ohmmeter) – Thunder Cloud
• 1 × Instruction Manual

Installation and Use Mode

1. Insert an 18650 battery (not included) into the compartment, observing the correct polarity (+/-).
2. Screw your rebuildable atomizer (RDA/RTA/RDTA) onto the device's 510 connector.
3. Power the device in the reading position to verify the exact resistance (Ohms) of your build.
4. Switch to ignition mode (Dry Fire) to gradually heat the resistance, eliminate hot spots, and align the coil.
5. Ensure the Ohm value remains stable before inserting cotton and e-liquid.
6. To explore more tools and materials for your DIY kit, check out our range of vaping tools and accessories here.

Maintenance and Care

• Use only 18650 batteries in good condition (with the casing/wrap intact).
• Keep the 510 threads clean and dry, removing any e-liquid or moisture residue.
• Do not force threading when screwing the atomizer to avoid damaging the internal spring connector.
• Turn off or remove the battery when the device is not in use for an extended period or during transport.

Safety and Recommendations

• This device is intended exclusively for testing and measuring rebuildable atomizers. It does not include nicotine.
• Keep out of reach of children and pets.
• Do not use resistances with short-circuit values (0.00 Ω) or force firing on unstable assemblies.
• Vaporization requires caution and attention. Product for adults 18+ only, not suitable for non-smokers, pregnant individuals, or people with health issues. For safe and responsible use, consult the Contraste Vaping® FAQ.
• If you notice swelling or overheating of the battery, strange taste, leaks or any other problem, stop using it immediately and contact us.