... Signal Frequency: 1Hz ~ 10KHz 3. Weight: 1.0kg YD440 Speed Monitors 1. Brief Introduction: YD440 rotation speed monitor (microcomputer speed measurement ... speed, angular velocity etc. The display device can be widely used in chemical, metallurgy, energy, light industry, textiles, electronics, and machinery ... instrument attached with analog 4~20mA output. YD440 Rotation Speed Monitors