Polmon instruments manufactures conductivity meters [model cm-510] that measure and log conductivity, tds and temperature with real time. These conductivity meters are of miniaturised and lightweight design, offering improved ease of use. Some of their features include: measure conductivity or tds and temperature; wide range conductivity/tds measurement; highly intelligent control system; field selectable application specific temperature compensation; temperature uncompensated conductivity [usp requirement]; pushbutton calibration, no screws to turn; backlit lcd indication gives a clear readout in any lighting conditions; direct readout in conductivity or tds, multiplication factor not required; splashproof housing protects internal components from accidental spills; easy-to-use plain text dialogue operation; and selectable temperature reference.