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Professional weather research - High-quality natural latex balloon for meteorological examinations, radiosondes & altitude measurements.Natural cream white colour. Burst height of 15,000 m - Our 100 g weather balloon from Hwoyee reliably reaches the upper atmosphere. Ideal for meteorologists, climate measurements and scientific projects. Compact Dimensions with Large Explosion Size - Body length 75-85cm, neck length ≥8cm, neck diameter ≤4.5cm. The burst diameter is approx. 180 cm - impressive unfolding in height. FLEXIBLE LIFT BASE - For higher loads more helium or hydrogen can be added. Safety instructions: To ascend, fill with helium (buy locally). Hydrogen only in the laboratory (dangerous, not for amateurs). Versatile - Whether for school projects, weather stations, promotions or aerial photography - this giant balloon delivers precise results for hobby and work.