ElectrochemistryBiosensorspH SensingGraphene Thumb size instrument - pH measuring May 29, 2020 • Martin Share This thumb sized instrument can be used with a number of ZP biosensors including our ZP solid state pH sensing, please read more. Read more facebooktwitterlinkedin Read more Nitrate Potassium Calcium pH Ammonium Phosphate Wearables Services FoodSense Biosensors Contact Products