This product has been discontinued by the manufacturer. Please contact us for the closest replacement - 1.DDO100 Meter2.DDO01-2M DO probe, cable length: 2m3.DDOS-01 Membrane refill solution: 30mL,1pc4.DDOSC Sensor caps: 3pcs/group, 1pkg5.DF01 Flexible probe Holder: 1pc6.DA01 Power adaptor