1Widely Applicable: This water quality detector can be used in many fields, including planting tents, swimming pools, drinking water, aquariums, fish tanks and brewing, etc. 2Accurate Measurement: Use laboratory quality glass probes for accurate up and down adjustments, the detection pen can provide you with accurate measurements. 3Multi Purpose: Multi functional detector, also used for reaction evaluation of industrial environment monitoring, biological experiment index detection. 4ORP Testing: ORP is a reliable indicator of water quality, the disinfection effect of swimming pool water, mineral water and tap water is verified by testing the ORP value. 5Small And Portable: Negative potential water quality detector, pen type design, compact and exquisite, easy to carry, digital display, easy to read, practical and fast. Item Type: Water Detector Material: ABS + Electronic Component Measuring Range: 0~1999mV Resolution: 1mV Accuracy: 5mV Battery: 4 x AG13 Button Batteries (Not Included) Working Environment: 0~50 Weight: Approx. 105g/3.7oz This Tester Can be Used for: Sewage Biological Treatment, Agricultural Soil Changes in Different Periods, Application of Water Treatment and Disinfection, Detection of Water Quality in Aquaculture Ponds 1 x Detector 1 x Manual 1 x Screwdriver