Item Type: ORP169F Meter Pen<br> Material: Plastic<br> Measurement Range: 0 - ±1999mg/LmV<br> Resolution: 1mV<br> Accuracy: ±5mV<br> Operating Temperature: 0 - 50 Celsius<br> Battery:4*1.5V (AG-13) Included<br> Waterproof: Yes<br> Dimension: 188mmx35mmx35mm<br> Colour:As Shown<br> Material:ABS<br> Operation:<br> 1. Remove the protective cap.<br> 2. Frist clean the electrode with distilled water,and suck it with filter paper.<br> 3. Press the OFF/ON key to switch power.<br> 4. Immerse the meter electrode in solution up to the immersion level.Under no circumstances immerse above display level.<br> 5. Stir gently and wait for the reading to stabilize.<br> 6. After use, switch off it,use the distilled water clean the electrode and replace the protective cap.<br> Package Contents:<br> 1 x ORP169F Meter Pen<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.