This product has been discontinued by the manufacturer. Please contact us for the closest replacement - 1.DDO10 Meter2.DO01-2M-H DO probe, cable length: 2m3.DOS-01 Membrane refill solution: 30mL,1pc4.DOSC Sensor caps: 3pcs/group, 1pkg 5.Charging cable: 1pc6.Hard carrying case: 1pc