... order by telling us the gauge lehgth and max. elongation) AW Extensometer:Full-bridge impedance: 350ΩOutput sensitivity: ≥1.5mv/vDegree ... % FSBridge voltage: 3-12v Gauge length (mm): 25, 50, 100, 200, 400, 500 Max. elongation (mm): 2.5, 5, 10, 15 ... requirements. And we can make it according to your order. AW Extensometer