Introduction
Product Overview
The A21 3-in-1 Testing Pen is a portable water quality testing pen that integrates pH, TDS, and EC measurement functions into one device, designed for quick measurement of acidity/alkalinity, total dissolved solids, and electrical conductivity in aqueous solutions.
Product Features
- 3-in-1 integrated design, one pen completes pH, TDS, and EC measurements
- One-key switching between measurement modes for convenient operation
- High-precision probe with fast response and stable readings
- Backlit LCD digital display, clearly readable in low-light environments
- IP67 waterproof and dustproof, suitable for humid environments and brief submersion
- Data hold function for easy locking and recording of readings
- 5-minute auto power off for energy saving
- Supports manual calibration to ensure measurement accuracy
- Compact structure, portable and easy to use
Key Specifications
- Measurement functions: pH, TDS, and EC 3-in-1
- pH measurement range: 0.01–14 pH, resolution 0.01 pH, accuracy ±0.05 pH
- TDS measurement range: 1–10000 ppm, resolution 1 ppm, accuracy ±2% F.S
- EC measurement range: 0–10000 µS/cm, resolution 1 µS/cm, accuracy ±2% F.S
- Temperature range: 0.1–60°C
- Waterproof rating: IP67
- Battery: 2 × 1.5V (LR44) button batteries
- Product dimensions: length 155mm
- Auto power off: Powers off automatically after 5 minutes of inactivity
- Display: LCD digital display with backlight
- Keys: Power key (ON/OFF), Hold key (HOLD/TEMP), Mode/Calibration key (MODE/CAL)
Usage Scenarios
- Quick water quality testing of drinking water and water purifier output
- Water quality monitoring for fish tanks and aquariums
- Nutrient solution concentration management for hydroponics
- Water quality testing for swimming pools and SPA pools
- Water treatment, environmental testing, and agricultural irrigation water assessment
- Laboratory teaching and routine water quality experiments
FAQ
Q: What parameters can the A21 3-in-1 Testing Pen measure?
A: It can measure pH (acidity/alkalinity), TDS (total dissolved solids), and EC (electrical conductivity).
Q: How do I switch measurement modes?
A: Press the MODE/CAL key to switch among TDS, pH, and EC measurement modes with one key press.
Q: How do I lock the current reading?
A: Use the HOLD/TEMP hold key to lock the currently displayed value for easy reading and recording.
Q: What is the auto power-off time?
A: If there is no operation within 5 minutes, the testing pen will automatically power off.
Q: How do I replace the battery?
A: Open the battery compartment and replace with 2 × 1.5V LR44 button batteries.
Q: What does the IP67 waterproof rating mean?
A: IP67 means the product is fully dustproof and can withstand brief submersion in water up to 1 meter deep, making it suitable for humid environments.
Q: What other functions does the MODE/CAL key have besides switching modes?
A: The MODE/CAL key is also used for calibration; you can calibrate the measurement mode as needed.
Q: Does the testing pen require regular calibration?
A: To ensure measurement accuracy, periodic calibration is recommended based on frequency of use.
Related Terms
- pH: Acidity/alkalinity, indicating the degree to which an aqueous solution is acidic or alkaline.
- TDS: Total Dissolved Solids, indicating the total content of dissolved solids in water, commonly expressed in ppm.
- EC: Electrical Conductivity, indicating the ability of a solution to conduct electricity, commonly expressed in µS/cm.
- ppm: Parts per million, a concentration unit used in TDS measurements.
- µS/cm: Microsiemens per centimeter, a common unit for electrical conductivity.
- F.S: Full Scale, indicating percentage error relative to the current measurement upper limit.
- IP67: Protection standard with dust rating 6 and water rating 7.
- LR44: A common button battery model with a rated voltage of 1.5V.
- Data hold: Locks the current measurement value on the display for easy recording and comparison.