With a threshold of 0.1 °dH, this indicator solution provides a reliable and precise reading of residual hardness, ideal for processes requiring continuous water monitoring. The liquid formulation allows easy handling and a dependable chemical reaction directly in the measuring device. Heyl's original indicator solution is suitable for use with the Testomat 808 and F-BOB series. With a guaranteed minimum shelf life of 7 months after shipment from our warehouse, the solution remains accurate and ready for use throughout the entire period.

Features of Indicator 302

At a defined residual hardness threshold of 0.1 °dH, the indicator solution reacts reliably, making it a stable choice for medium hardness ranges. The bottles can be used directly in the device. The indicator ensures consistent dosing and reliable results over many measurement cycles.

Applications of the Indicator Solution

• Boiler feed water monitoring
• Process water
• Reverse osmosis systems and technical supply systems