... Recognition. 2, Message Indicator. 3, pH Range: -2.00~16.00pH; Accuracy: 0.01pH. Portable digital ph meter portable meters includes models 220, 221, which ... (H)mmWeight300g300gAccessories:pH Electrode, Standard pH Buffers, Temperature Probe, Battery. Optional Accessory: Carrying Case. Warranty:One year after purchasing.PICTURES: Portable digital ph meter (pH / mV ...