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Ec21 Hollow Shaft Incremental Encoder 21mm Ring Encoder. Customization Support: Full customization available with drawings, usage, and requirements provided. High Resolution Output: Provides 15 pulses per 360 degrees for precise incremental measurement. Long Rotational Life: Endurance up to 30,000 cycles for reliable long-term operation. Fast Sample Lead Time: Samples ready in just 3 working days for quick evaluation. Self-Sourced Materials: 80% raw materials supplied in-house ensuring quality and speed. Free Sample Availability: Small quantity samples provided free, customer covers air freight. Comprehensive Inspection: 100% visual and functional inspection on all finished products.