Welcome to our store! We are pleased to present our compact and portable ORP tester. It is designed with a pen shape, making it easy to use and store. The large and clear LCD screen allows for easy reading and accurate measurements.

Our tester is made with high-quality electronic components to ensure high accuracy. It is suitable for use in various water systems such as water sources, aquariums, hydroponics, and swimming pools. The ORP tester has a resolution of 1 mV, providing very high sensitivity.

Here are the specifications for our ORP tester:
- Model: ORP-169
- Measurement range: -1999 - 1999mv
- Resolution: 1 mV
- Accuracy: ±5mV
- Operating voltage: 4*1.5V (AG-13 battery) (batteries not included)
- Working temperature: 0℃–50℃
- Correction: 1-point correction
- Product dimension: 188*35*35 mm / 7.4*1.4*1.4in
- Weight: 290g / 10.2oz

Here are the steps to use the ORP tester:
1. Remove the protective cap.
2. Press the \"ON/OFF\" button to turn on the power.
3. Insert the electrode into the solution to be tested, shake it gently, and read the displayed value after the value is stable.
4. Press the \"HOLD\" button to retain the current measured value. If you need to measure again, press the \"HOLD\" button again to automatically release the hold status.
5. After use, press the power button, wash the electrode with distilled water, and put on the protective cover.

Please note the following precautions:
1. There may be white crystalline salt around the electrode, which is a normal phenomenon. It will dissolve and disappear when the electrode is immersed in clean water.
2. When testing the ORP value, it may take a few minutes to stabilize and the displayed value may change slowly.
3. The display value in ORP and air may jump without a regular pattern, which is normal.
4. After use, turn off the power, wash the electrode with clean water or distilled water, and dry it with a soft tissue before putting on the protective cover.

The package includes:
- 1 ORP tester
- 1 installation tool
- 1 user manual

100% satisfaction: Our customers are our top priority. If you find any product problems after receiving the item, such as damage and incorrect quantity of goods, please contact the seller immediately. We do our best to provide you with satisfactory after-sales service.

Note: The actual product color may differ from the picture due to light. There may be a slight deviation in the product's dimensions.