The Click Mat clicks at the correct pressure, telling you when you have tamped with a specific force. To use it simply remove the silicone tamping sheet from the Click Mat and use the included allen key to adjust at which force it shall signal. You can set it between 10 to 25 kg.
The signal is a very distinct “click!” at the moment you hit the target force. All materials used in the product are top notch, stainless steel, black nylon and food safe silicone.