Description: 【Underwater Communication and Measurement】Diving Pointer Stick gives divers a reliable tool for underwater communication and measurement, so you point marine life, signals your dive , and gauge distance with confidence on every dive. 【Lightweight Aluminum Alloy Construction】Scuba Diving Pointer Stick is built from lightweight aluminum alloy that feels balanced in your hand, giving you a sturdy, easy carry tool that won't slow you down or weigh out your BCD pockets. 【Easy to Use for Every Diver】Diving Pointer features a slim, easy-grip design that works for beginners and seasoned divers alike, making it simple point, tap, signals, and measure without complicated training or setup. 【Compact 35cm Length forAround Diving】Tank Knocker measures 35cm long with an 8mm diameter, giving you a compact pointer that's easy to stow in your BCD pocket, gear bag, or dive boot, so it's ready whenever you need to communicate or measure underwater. 【Versatile Tool for Underwater Signals and Tasks】Tank works as an underwater signals stick, measurement tool, and dive communicator, making it a versatile addition to any recreational or professional diver's kit, whether you're exploring reefs or training in open water. Specification: Material: Aluminum Alloy Size Chart: 8x350mm Package Includes:   1 Scuba Diving Aluminum Pointer Stick Note: Please allow slightly errors 1-2cm differences due to manual measurement.