Introduction
The HI98121 Hanna pH ORP Temperature Combo Water Tester is a reliable, waterproof device designed for quick and easy measurements of pH, Oxidation-Reduction Potential (ORP), and temperature. This accurate tester features 0.01 pH resolution, automatic two-point calibration, and temperature compensation, all integrated into a single, portable, pocket-sized unit. It eliminates the need for multiple meters, streamlining your routine water quality measurements.
What's in the Box
Upon opening the package, verify that all components are present and in good condition. The standard package includes:
- HI98121 Combo Water Tester
- Cuvettes
- Battery
- Instruction Manual
- Quick Start Guide
Image: The HI98121 tester, cuvettes, and documentation neatly arranged within its packaging.
Product Overview
Image: Front view of the HI98121 tester, displaying its screen with readings and control buttons.
Image: A slightly different angle of the HI98121 tester, highlighting its compact design.
Image: Detailed view of the sensor tip and the base of the HI98121 tester, with the model number clearly visible.
Image: A closer look at the sensor and electrode connection point of the HI98121.
Setup
Battery Installation
- Locate the battery compartment cover on the back of the device.
- Use a small screwdriver or coin to open the cover.
- Insert the battery (as specified in "What's in the Box") ensuring correct polarity.
- Replace the battery compartment cover and secure it tightly to maintain the waterproof seal.
Electrode Connection
The HI98121 features an integrated electrode. Ensure it is clean and properly seated before use.
Image: A visual representation of the electrode connection area on the HI98121 tester.
Operating Instructions
Turning On/Off
- To turn on the meter, press the ON/OFF button.
- To turn off the meter, press and hold the ON/OFF button until the display turns off.
Taking Measurements
- Ensure the electrode is clean and conditioned.
- Immerse the electrode tip into the sample solution, ensuring the liquid level is above the sensor junction.
- Allow a few moments for the reading to stabilize. The display will show pH, ORP (mV), and temperature readings simultaneously.
- Press the MODE button to cycle through different display modes if available (e.g., showing only pH, ORP, or temperature).
- Press the SET/HOLD button to hold the current reading on the display. Press again to release.
Temperature Compensation
The HI98121 features automatic temperature compensation (ATC) for pH readings, ensuring accuracy across varying sample temperatures. The integrated temperature sensor automatically adjusts the pH measurement based on the sample's temperature.
Calibration
Regular calibration is crucial for maintaining the accuracy of your HI98121 tester. The device supports automatic two-point pH calibration.
pH Calibration
- Prepare two fresh pH buffer solutions (e.g., pH 7.01 and pH 4.01 or pH 10.01).
- Turn on the meter.
- Rinse the electrode with distilled water and blot dry.
- Immerse the electrode into the first pH buffer solution (e.g., pH 7.01).
- Press and hold the CAL button (if available, or refer to quick start guide for specific button sequence for calibration) until "CAL" appears on the display. The meter will automatically recognize the buffer.
- Once the first point is calibrated, rinse the electrode and immerse it into the second pH buffer solution.
- The meter will automatically complete the two-point calibration.
- Exit calibration mode (refer to quick start guide for specific button sequence).
Note: ORP calibration is typically not required for standard ORP meters as they measure relative potential. If specific ORP calibration is needed, consult the detailed instruction manual provided with the product.
Maintenance
Electrode Cleaning and Storage
- After each use, rinse the electrode thoroughly with distilled or deionized water to prevent sample residue buildup.
- For stubborn deposits, use a mild cleaning solution specifically designed for pH/ORP electrodes. Avoid abrasive materials.
- Always store the electrode with its protective cap filled with storage solution (or pH 7 buffer if storage solution is unavailable). Never store in distilled water.
Battery Replacement
When the battery indicator appears on the display, replace the battery promptly to ensure accurate readings. Follow the battery installation steps outlined in the "Setup" section.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display / Meter won't turn on | Dead battery; Incorrect battery installation | Replace battery; Check battery polarity |
| Unstable readings | Dirty electrode; Air bubbles around sensor; Electrode not immersed deep enough; Expired buffer solutions | Clean electrode; Gently tap meter to dislodge bubbles; Ensure proper immersion; Use fresh buffer solutions |
| Inaccurate pH readings | Needs calibration; Electrode dry or damaged; Contaminated buffer solutions | Perform two-point calibration; Rehydrate electrode in storage solution; Use fresh buffer solutions; Replace electrode if damaged |
| "Err" or error message on display | Calibration error; Sensor malfunction | Repeat calibration carefully; Contact customer support if error persists |
Specifications
| Model Number | HI98121 |
| Brand | WLR Industries |
| Measurement Parameters | pH, ORP (mV), Temperature |
| pH Resolution | 0.01 pH |
| Temperature Compensation | Automatic Temperature Compensation (ATC) |
| Calibration | Automatic, Two-point pH calibration |
| Power Source | Battery Powered (1.5 Volts Min. Operating Voltage) |
| Color | Green |
| Dimensions | 7.32 x 5.91 x 1.42 inches |
| Weight | 11.68 ounces |
| Manufacturer | WLR Industries |
Warranty and Support
For warranty information, technical support, or service inquiries, please contact WLR Industries customer service. Refer to the contact details provided in the product packaging or visit the official WLR Industries website.
This product is from a small business brand. Your support is appreciated.
For additional resources, you may visit the WLR Industries Store on Amazon.