Digital Mili Second Meter Power Supply: 220V+/-100%, 50Hz Range: 0.0001S~9999.9S (4 Grades) Function: run, act Digital Mili Second Meter1.Model:4172.One-Way--Air contact cose and cut time,action time of positive voltage .Dual-time difference of singals .3.Start signals:Air contact,positive voltage,zero voltage (optional)4.Range: 0.0001S~9999.9S (4 Grades)Function: run, act Deflection: ≤ 5 × 10- ...