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Winter GmbH & Co. KG manufacture the most popular soaring variometers in the world. Formed in 1931, today they still produce top quality flight instruments relying on 3 key factors: Experience, Qualification, and Quality management. They offer instruments in 80mm (3.125″) and 57mm (2.25″). Winter provides most variometers with linear scales, however an expanded logarithmic scale is also available. Your basic response rate is defined by how long it takes the variometer to read 65% of its final reading due to sudden changes in vertical speed. The standard variometer that you find in most gliders, especially trainers has a 3 second response rate. Winter also provides response rates in the following: 1.3, 1.6, 1.8, and 2.2 seconds. Units can be ft/min, knots, and m/s. Ranges from ±400ft/min to your standard ±1000ft/min to ±3000ft/min.