12cm Long Electrode Digital pH & Temperature Meter, 0.00~14.00 Water Quality Tester Thermometer, Sensor Probe for Laboratory Cylinder/ Flask, Aquarium, Beverage, Hydroponics, Food processing, Pool Specially Long and Slim Design for Testing Samples in Lab Glassware with Cylindrical Neck, e.g. Erlenmeyer Flask/ Graduated Cylinder. The probe is 12cm long; Total length of pH meter is 22.6cm long. Storage Bottle at the End of Probe to Keep the Sensor Wet. There is liquid inside the little white storage bottle to enhance the measurement accuracy and its life time. Compact Size and Light Weight. Easy to store, keep and carry around. Big and Clear LCD provides instant pH and Temperature measurement display One Touch Auto-Calibration up to 3 points