Conductivity MeterThis Myron EP10 is the most popular for boiler water testing. This unit is easy to use and long lasting.What is a conductivity meter?A conductivity meter measures the electrical resistance of the water. For boilers, the conductivity meter is used to check the boiler water conductivity and to calibrate the conductivity controller. Knowing the conductivity is important for determining the cycles of concentration and to ensure you are maximizes the amount of time you are reusing the water. Use conductivity standard to calibrate your conductivity meter.What range is this meter good for?This product contains an easy dial for multiple ranges. The range of this product is: 0 to 10 ��M/��S 0 to 100 ��M/��S 0 to 1000 ��M/��S 0 to 10,000 ��M/��S