How can you make inch marks on a homemade rain gauge?

Use a waterproof marker on the bottle.

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  1. Use a pencil on the water
  2. Use tape on the rain
  3. Use a waterproof marker on the bottle ✔

Why: Use a waterproof marker to make inch marks on the side of the bottle.

Huh, didn't know that: Use a waterproof marker to make inch marks on the side of the bottle.

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Waterproof marks survive a real washout.
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References

Answer: Use a waterproof marker on the bottle. Use a waterproof marker to make inch marks on the side of the bottle.

  1. Scouting America: Weather www.scouting.org/merit-badges/weather
    use a waterproof marker to make inch marks on the side of the bottle
    Checked 2026-11-07.

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