eXact® iDip® 570 Marine Starter Kit TDS this is the answer

this is the answer

eXact® Micro 20 Marine Test Kit (486700-BTMA)

produce scale buildup in water pipes

Mg2+ and calculate from/to Degrees or ppm as CaCO3 automatically within app

If low range detection of Fe+2 is what you need

eXact® iDip® 570 Marine Starter Kit TDS this is the answerThe exciting new eXact iDip 570 nm Smart Photometer System by ITS, Inc. harnesses the power of smart devices and the simplicity of design to handle the heavy lifting of complex water testing. The smart phone app is designed to work seamlessly with the waterproofed handheld unit with parameter information, data storage and GPS tracking included. With guaranteed exact results in less time, our new smarter process will revolutionize water testing. The