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

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 building.

⚠️ Measurement/test device — battery 18650, atomizers, tools or e-liquids not included. 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-loaded adjustable
• Power: 1x 18650 Battery (not included)
• Proteções: Multiple integrated circuit protections
• Compatibilidade: All rebuildable dripping atomizers with 510 thread

Product Benefits

• 2-in-1 design: measures Ohms value and allows preheating/stabilizing resistances at the base.
• 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.

Packaging Contents

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

Installation and Use Instructions

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. Turn the device to the reading position to verify the exact resistance (Ohms) of your build.
4. Switch to ignition (Dry Fire) mode to heat the resistance gradually, eliminate hot spots, and align the coil.
5. Ensure the Ohm value remains stable before placing cotton and e-liquid.
6. To explore more tools and build 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 outer wrap intact).
• Keep the 510 thread clean and dry, removing any e-liquid or moisture residues.
• Do not force the threads when screwing in 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 contain nicotine.
• Keep out of reach of children and pets.
• Never use resistances with values in short circuit (0.00 Ω) or force firing on unstable assemblies.
• Vaporization requires care and attention. Product strictly for adults 18+; not suitable for non-smokers, pregnant people, or those with health issues. For safe and responsible use, consult the Contraste Vaping® FAQs.
• If you notice swelling or overheating of the battery, odd taste, leaks or any other issue, stop use immediately and contact us.