These little red floats make reading your rain gauge way easier. They're designed to float on top of the water inside your cylindrical rain gauge tube, giving you a clear, bright red marker to see the water level from a distance. This 10-pack is perfect because you'll always have spares. Made from lightweight, waterproof EVA foam, they're durable and won't waterlog. Compatible with Toiclebor rain gauge models RM-LBS7-002, RM-BS7-001, RM-SS1-098, and should work with any similar gauge that has an inner diameter larger than 3.5 cm (about 1.38 inches). Just drop one in your gauge after it rains. Helps you track rainfall accurately for gardening, weather tracking, or just curiosity. Much better than squinting at a water meniscus. Simple, effective, and cheap upgrade for your backyard weather station.