Digigauge brew pressure Gauge (electric, battery operated)....£19.95

I love this product, although unfortunately it’s not as pretty as I would like. Measuring only 80mm L x 40mm W and a mere 12mm thick. It uses 1 AAA battery (not supplied) and only switches on when you pull a shot! Battery life is claimed to be around 3 months of normal domestic use.
The measurement end (called a field effect transducer by the manufacturer), simply attaches to the outside of the pump line just after the OPV valve, using a small cable tie (they do give you a generous 80cm of cable to do this). It measures pressure in the range 0 - 20 bar and the manufacturer claims it’s accurate to +/- 0.05 bar. This takes literally only minutes to fit!

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