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CL-M21 Digital Chlorine Tester - Swimming Pool Water Quality Test Pen with Temperature Meter, Backlit LCD and Detachable Electrode
Open Box - Excellent: The seal is broken but the product is still in its original packaging, it looks brand new and includes all original parts and accessories.
The CL-M21 digital chlorine tester is a practical water quality test pen designed for checking residual chlorine and water temperature quickly and accurately. With a chlorine measurement range of 0-4.00ppm, high sensitivity detachable electrode, backlit LCD display, and automatic power-off function, it is ideal for swimming pools, aquariums, drinking water checks, hydroponics, industrial water testing, and wastewater monitoring.
Key Features and Specifications
- Dual parameter detection - Measures residual chlorine and water temperature in one compact device
- 0-4.00ppm chlorine range - Suitable for checking chlorine levels in pools, water systems, and other applications
- High accuracy measurement - Chlorine accuracy of 0.01ppm for reliable water quality readings
- Detachable electrode probe - Sensitive plug-in probe design provides stable detection and easier maintenance
- Backlit LCD display - Clear dual-line screen makes readings easier to view, even in low-light conditions
- C/ F temperature switch - Easily change between Celsius and Fahrenheit temperature units
- Smart auto power-off - Turns off automatically after 5 minutes of inactivity to save battery
- Multi-scene use - Suitable for swimming pools, drinking water, aquariums, hydroponics, industrial water, and wastewater treatment
- Lightweight handheld design - Weighs only approx. 0.093kg for easy carrying and daily use
- Durable ABS housing - Practical material for regular water testing environments
Technical Specifications
- Model - CL-M21
- Product type - Digital chlorine tester / water quality test pen
- Chlorine measurement range - 0-4.00ppm
- Chlorine accuracy - 0.01ppm
- Temperature range - 0-60 C / 32-140 F
- Working temperature - 0-60 C
- Display - Backlit LCD
- Electrode type - Detachable high sensitivity probe
- Auto shut-off - After 5 minutes
- Battery - 4 x 1.5V LR44 batteries
- Material - ABS
- Dimensions - 184 x 44 x 45mm
- Net weight - 93g
Ideal Examples of Usage
Use the CL-M21 tester to check swimming pool chlorine levels before use, monitor aquarium water conditions, test water in hydroponic systems, inspect drinking water sources, or support routine checks in industrial and wastewater applications. It is especially useful when you need quick readings without relying on colour comparison strips.
Why This Chlorine Tester Is Perfect to Buy
This tester is perfect if you want a simple, portable, and easy-to-read device for monitoring chlorine and temperature. The backlit LCD display makes results clear, while the detachable electrode offers practical long-term use. With automatic power-off, compact size, and wide application range, the CL-M21 is a useful tool for pool owners, water maintenance users, aquarium keepers, and anyone who needs regular water quality checks.
Interesting Facts About Digital Chlorine Testers
Digital chlorine testers are popular because they give direct numerical readings instead of relying only on colour charts. This can make water testing faster and easier, especially for swimming pools where chlorine levels need regular monitoring. Temperature measurement is also useful because water temperature can affect comfort, water treatment performance, and testing conditions.
Categorias relacionadas: Acessórios telemóveis, Casa
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