Instruments for Fountain Solution 

• Thermometer
• pH Meter 
• Conductivity meter
• Refractometer  (0-10%)

There is a lot of instruments on the market, the following are some of them.

	Extech EC500 Multitester TDS, Conductivity, pH, Salinity, Temperature	Refractometer 0-10% with Automatic Temperature Compensation

It is important to use temperature compensated instruments. 

Heidelberg North America has published a nice video presenting the basics of measuring Fountain Solution
Incorrectly measuring fountain solution can lead to inconsistent results in your printing process. Watch this video to learn the proper way.