Generic PH Items Explicitly Pen PH Meter with Temperature Compensation (Red) It ships from China. Usually takes 9-15 days for arrival, sometimes, it would be sooner than this deadline. But, we will not accept returns if this item is damaged during the installation process. Net weight: 100 g, package weight: 20 g. This digital pen style pH meter is an ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. This Pocket Digital pH meter introduces advanced technology and imported components, greatly reducing the volume and costs and maintains the existing good quality. It used to be universal among the majority of users of all ages.