These are test kits containing small equipment & reagents to test Chloride, hardness, nitrite & Alkalinity of Boiler & Cooling water. 

A) NITRITE TEST KIT 

This test kit is used to measure Nitrite levels in cooling water of a closed cooling system

B) Hardness TEST KIT 

This test kit is used to measure hardness of boiler water & cooling water systems.

C) CHLORIDE TEST KIT

This test kit is used to measure chloride of boiler water & cooling water systems.

D) Alkalinity Test Kit

This test kit is used to measure alkalinity of boiler water.