Mudder 0.1 Readout Accuracy Digital Pocket Pen pH Meter/ Water Quality Tester with ATC (0~50), 0.0 - 14.0 pH Measurement Range (Red) EASY CALIBRATION by yourself. Including little implement, buffer solutions for calibration is needed but not included POCKET SIZE lightweight, handheld design for portability and convenience, Use it at any place 0~50&#x2103; ATC FUNCTION: measure pH accurately in fluctuating temperatures PROFESSIONAL and high quality due to its advanced microprocessor technology, 0.0-14.0 Ph range LARGE LCD SCREEN&#xFF0C;Agile glass probe, 0.1 pH readout accuracy, 0.1 Resolution , easy to readout