Equipment: glass, water regular, test paper for PH.
Time. Around 40 min.
1 version.
Keep glass in one hand for 15 min. Than measure PH results according instruction.
Change hands and water. The same procedure repeat.
My right hand shows 7.0-7.2
My left hand shows 6.5-6.2.
2 version.
The same experiment, but glass with water on the table. Hand near the glass, about 20-30 cm.