Measure range :0.00-14.00PH Resolution:0.01PH Accuracy :+/- 0.1PH Operating temperature:0C-50C Automatic temperature Compensation:0C-50C Product Description: TT-PH037 PH completely waterproof pocket pen, with excellent water resistance and field applicability. Waterproof rating of IP56. The instrument is simple, inexpensive, sturdy and durable, fully in line with a variety of industry testing needs. Specification: Measure range :0.00-14.00PH Resolution:0.01PH Accuracy :+/- 0.1PH Operating temperature:0C-50C Automatic temperature Compensation:0C-50C Power supply :4x1.5V (AG-13 Button battery )(Not Included) Calibration:Manual ,at one point through trimmer Weight :67g Operation : 1.Remove the protective cap 2.First rinse the electrode with distilled water ,and suck it with filter-paper . 3.Turn the meter on by pressing the ON-OFF button located on the cap of battery case. 4.Immerse the ph meter electrode in the solution to be tested . 5.Stir gently and wait for the reading to stabilize. 6.After use ,rinse the electrode with water to minimize contamination .Turn the meter off by pressing the ON-OFF button . 7.Store the electrode with a few drops of distilled water or ionized water in the protective cap . 8.Always repalce the protective cap after use . Note : 1. The glass bulb of the electrode is fragile .Treat it carefully .Do not touch it by hard tools and fingers .Suck the water on it gently when cleaning . 2.Clean the electrode with distilled or ionized water every time before and after use . Color: purple Products include: 1pc Dimension: 175mm*30mm*22mm