Features: This digital pen style pH meter is an ideal instrument for aquarium fishing industry swimming pool school laboratory food !#!amp!*! beverage etc. 100% brand new meter with calibration screwdriver and 2 sachets of buffering solution for calibration. Excellent meter very accurate and durable Ideal instrument for aquarium fishing industry swimming pool etc Specifications: Measuring pH Range: 0.0 - 14.0 pH Resolution: 0.1 pH Accuracy: 0.1 pH (at 20C/68F) 0.2 pH Operating Temperature: 0 - 50C (32 - 122F) Calibration: Manual 1 point Relative Humidity: !#!lt!*!95% Life: Approx.700 hours of use Size: approx 150mm x 29mm x 20mm Color: Yellow !#!amp!*! red(as pictures shown) Trimming: By potentiometer Battery: 3*1.5v (AG-13 button battery) (included) Color: yellow Net Weight: 113g Package contents: 1 x Digital PH Meter Tester Pen( Batteries are included) 1 x Calibration Adjustment Screwdriver 2 x Pouches of calibration buffer solution(pH 4.0 !#!amp!*!pH 6.86) 1 x User Instruction Manual (English) 1x plastic case