Beckman Coulter ? 400 Series Handheld meters perform excellently in all applications in the lab, factory, or field. All handhled meters have Bluetooth connectivity. It has GLP/GMP features, self-diagnostics, programmable data logging intervals, and can store or recall a maximum of 999 data points. The meters are IP67 rated and has a waterproof BNC connector for ISE and pH/ Its locking connectors are also waterproof. These locking connectors are for conductivity probes and dissolved oxygen. It has a unique design that floats in water. Depending on the mode, temperature compensation can be manual or automatic and has five-point calibrations. The DO models also have automatic barometric pressure compensation. A Smartlogger II computer software interface instructions on how to communicate with Labview or other LIMS software package intended for adherence to 21CFR Part 11 are included. They utilize 4 AA batteries, which are included in the package, for a maximum of 200 hours continuous use. They also include a 3-year replacement warranty from the manufacturer.