Jumbo Test Tubes with Stand Chunky, durable test tubes put serious science safely within reach for young students. Supports inquiry-based investigation and hands-on observation. Plastic tubes are safe at temperatures from 10°-200°F and feature calibration marks (25, 50, 75 and 100 ml). Hand wash. Includes 6 test tubes, different colored lids (to track experiments), sturdy rack and Activity Guide. Tubes measure 6"H x 1 1/2" in diameter. Grades PreK+ LER 2788 Set of 6 plus stand