Technical Specification:   1, Measuring range: 60～9999r/min 2, accuracy: 2×10-4×N±1digit 3, store time :no limit 4, adoption time:1s(automation) 5, weight:300g(include battery) 6, measuring distance: 50～400mm  7, display: 4-digital LED 8, temp: 0～＋50℃ 9, battery: 4×1. 5(DC) alkalinity battery 10, dimension: 78mm(L)×38mm(W)×180mm(H) KL-006 Tachometer   Technical Specification:  1, Measuring range: 20～50000r/min 2, accuracy: 2×10-4×N±1digit 3, store time :no limit 4, adoption time:1s(automation) 5, weight:300g(include battery) 6, measuring distance: 50～400mm  7, display: 5-digital LCD 8, temp: 0～＋50℃ 9, battery: 4×1. 5(DC) alkalinity battery 10, dimension: 78mm(L)×38mm(W)×180mm(H)