U-shaped Grooved Wheel: Featuring a U-shaped grooved roller (20mm width), this wire length meter securely grips fishing lines, textile threads, and cables to prevent slippage. The deep groove ensures high-precision measurements for soft or thin materials, making it an essential tool for industrial production lines, crafting, and DIY projects Multi-Unit & Red LED Display: Switch effortlessly between Feet, Inches, Meters, and Yards to suit any standard. The bright red LED digital display offers crystal-clear visibility in all lighting conditions—from dim factories to bright outdoors—allowing operators to read measurements quickly and accurately without strain, boosting overall workflow efficiency Alarm & Power-Off Memory: Set a preset value(up to 999999) to trigger an audible/visual alarm when the target length is reached, prompting immediate action like stopping. Equipped with power-off memory, this cable length counter retains the last measurement data after a blackout, resuming seamlessly upon power restoration without losing your progress Dual Relays & Wide Voltage: Built with AL1/AL2 relay outputs to connect external devices like automatic cutters, solenoid valves, or conveyors for automated control. It supports a wide AC100-240V input and outputs safe DC12V, ensuring stable performance globally. Perfect for integrating into existing industrial machinery and complex automation systems Safety Protection Design: The durable blue enclosure includes external switch protection wiring, shielding terminals from dust, moisture, and impact. This robust build prevents short circuits and extends the device's lifespan in harsh workshop environments, ensuring reliable, long-term operation for your wire length counting needs