Not exactly high tech but they make my growing easier. These little tags work great for 30 ml medicine cups or peat pellets if you germinate in things like this. Cheap too at a penny apiece. Only bad thing is they come on the slow boat from China. The free shipping package arrives in about three weeks.
https://www.ebay.com/itm/100pcs-Easy-Plastic-Plant-Labels-Garden-Stake-Seed-Label-Tags-5x1cm-Pot-Marke/142829647961?ssPageName=STRK%3AMEBIDX%3AIT&var=441831272291&_trksid=p2057872.m2749.l2649
https://www.ebay.com/itm/100pcs-Easy-Plastic-Plant-Labels-Garden-Stake-Seed-Label-Tags-5x1cm-Pot-Marke/142829647961?ssPageName=STRK%3AMEBIDX%3AIT&var=441831272291&_trksid=p2057872.m2749.l2649