You might also be interested in these jbl iron test kit.
JBL Water Test Set, For freshwater aquariums, ProAquaTest pH 6.0-7.6
JBL
£ 8.89
To the product (2 offers)
36% off
JBL ProScan Water Analysis by smartphone - The new generation
JBL
£ 12.20
free shipping
To the product (5 offers)
JBL ProAquaTest Lab Water Test Case with 14 Tests and Accessories for Freshwater Aquariums and Tap Water
JBL
£ 87.03
free shipping
To the product (4 offers)
JBL Test Combi Set Plus Fe, Test case with the most important water tests in freshwater aquariums, incl. iron test
Monitors the water values in aquariums simply and reliably. Determines: pH value, carbonate hardness, iron, nitrite, nitrate, CO2 (calculation via table)
£ 54.13
free shipping
To the product (1 offer)
Which.One Highlight
JBL Water Tests and Refills for Aquarium, Pond and Tap Water
