Hanna Instruments added another great product to its small and simple “Checker” line of products with its Phosphorus Ultra Low Range Checker. The new model, HI 736, is similar to the previously released HI 713 Phoshate Checker except taking the reading down to a one parts-per-billion (PPB) resolution, where the original phosphate colorimeter read down to a part per million (PPM) resolution. The Phosphorus Ultra Low Range Checker features the same shape and size as the other handheld “pocket” colorimeters Hanna produces with accuracy ±5% of reading ±10 PPB (at 1 PPB resolution). The new Phosphorus ULR Checker retails for $49.50 and is currently available on the Hanna website. For just under $100, you can get both test meters to give you quite an accurate range of PO4 measurements well under the total cost of the higher-end PO4 meters on the market. It’s great to see more ingenious and affordable products like this making high quality equipment available to the average reefer.