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I've always just used something like this: https://www.amazon.co.uk/Ascher-Portable-Digital-Back-lit-Weighing/dp/B01FQHE25U/ref=sr_1_8
Though this time around I went all out and went for this: https://www.amazon.co.uk/Milligram-Portable-Calibration-Tweezers-Precision/dp/B07R1L2MFP/ref=pd_sbs_79_3/262-1990052-4723602
Personally never seen the value in expensive scales. All my watches have a stopwatch function so I have no use for timers on scales. Unless you're at the point where you're carefully monitoring flow rate throughout your espresso extraction any sort of smart scale is money that could be better used elsewhere.
Also, what budget scales should I get that fit on the drip tray of a Gaggia Classic?