TPI 395 Handheld Refractometer - Use the 395 to determine the freezing point of fluids including those used in hydronic heating systems. The 395 Handheld Refractometer is designed to give an accurate reading regarding the freezing point of fluids used in hydronic heating systems. It is quick and easy to use. Place a drop of fluid on the prism, close the plastic lid, and look through the eye piece: where the blue and white colors meet indicates the freezing point of the coolants or the state of change for batteries.

TPI 397 Pen Style pH Meter with 0.10-14.00pH Range - The TPI 397 Accurate pH Tester Pen has features waterproof design to protect the meter, low power consumption to extend the battery life, auto-off function turns power off automatically after 10 minutes, Automatic Temperature Compensation (ATC) for accurate readings, replaceable glass test tip electrode that screws on for a solid connection compatible with the pH-902A Changeable electrode and the pH-901A Fixed electrode.

The 75240 Robinair Coolant and Battery Refractometer (Fahrenheit Scale) can be used for measuring the freezing point of either propylene or ethylene glycol based cooling systems. It can also be used for checking the strength of electrolyte solution batteries. This precision instrument features high-quality optics with ultra smooth focusing.

This instrument is designed for testing the concentration of battery fluids, antifreeze liquids and cleaning fluids. The percentage indicator indicates the point of freezing for both propylene glycol and ethylene glycol. It can also be used for checking the strength of electrolyte solution batteries.