This STree PH tester is the perfect device for determining the acidity or alkalinity of liquids. Each unit comes with a carrying case and small screwdriver for precise calibration; furthermore, It is easy to use - simply remove the protective cap and immerse the electrode in the solution to be measured. Included with the meter are 6.86 and 4.01 pH buffers for an initial calibration - Instructions for calibration are also included with this product.

Specifications
pH measuring range : 0.00 - 14.00 PH
Resolution : 0.01 PH
Accuracy : ±0.1 PH
Backlight LCD Display for working at low lighting environment
Automatic Temperature Compensation : 32 - 122 °F (0 - 50 °C).
Operating Temperature : 32 - 122 °F(0 - 50 °C)
Power: 4 x 1.5 V (AG-13) button cell batteries (Installed)
Dimensions : approx. 5.90' x 1.06' x 0.79' inch (151 x 33 x 20 mm)
Weight : approx. 1.88ounce (53g)

One set included
1 x Pen-type pH meter
2 bags each of pH 4.01 and pH 6.86
Calibration Buffer Powder
1 x Instruction Manual
1 x Carrying case
1 x Adjustment screwdriverSTree