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Professional weather research - High-quality natural latex balloon for meteorological examinations, radiosondes & altitude measurements. Bursting height of 25,000 m - Our 500 g weather balloon reliably reaches the stratosphere. Ideal for meteorologists, climate research and science projects. Natural cream white colour. STRONG LIFTING POWER - Net buoyancy 905g, total buoyancy 1655g with recommended fill volume of 2.0-2.5m³. Perfect for aerial photography, measuring probes or as an eye-catcher at folk festivals and large openings. Large Dimensions - Body length 170-190cm, neck length ≥10cm, neck diameter ≤6.4cm. The burst diameter is approx. 500cm - Impressive size in height. Flexible lifting force adjustment on the bottom - add more helium or hydrogen for higher loads. Safety instructions: To ascend, fill with helium (buy locally). Hydrogen only in the laboratory (dangerous, not for amateurs). MULTI-PURPOSE - Whether for school projects, weather stations, promotions or aerial photography - this giant balloon delivers reliable performance for professionals and hobby scientists.