Testo 558s Ultimate Refrigeration Kit (0564 5000 04) Running hoses between separate gauges, thermometers and a vacuum pump slows down every job and adds another point where a reading can go wrong. The Testo 558s Ultimate Refrigeration Kit replaces that setup with one digital manifold that connects wirelessly to everything else in the kit via Bluetooth, so pressure, temperature, vacuum and electrical readings all land on the same touchscreen. The 558s manifold itself measures -1 to 60 bar with 0.25% full-scale accuracy, connects over a 150m Bluetooth range, and is rated IP54 for site use. It's compatible with A2L and A3 flammable refrigerants — an increasingly important spec as the industry moves toward lower-GWP refrigerants that carry a flammability rating — and stores 96+ refrigerants on board, with your most-used ones saved as favourites so yo