This HANNA H1758U Handheld Colorimeter is a must-have for marine enthusiasts. It is designed to check the calcium levels in your aquarium. With its digital display, you can easily read the measurements. This product is perfect for those who want to keep their marine pets healthy and happy. It is also a great addition to your aquarium accessories collection. The HANNA brand is known for its high-quality products, and this calcium checker is no exception.

Missing chemical for calcium. All other parts are new.