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TDS-4 HM Digital TDS meter with calibration
Rating
HM Digital TDS-4 is a compact, lightweight TDS meter for quick assessment of the amount of dissolved substances in water (ppm). It offers a HOLD function with an audible signal, a large LCD display, and automatic shut-off after 10 minutes of inactivity. The device is factory calibrated and allows for manual calibration with a mini screwdriver. Measurement range is 0-9990 ppm.
Description
The TDS-4 HM Digital is a pocket TDS meter with calibration, designed for a quick assessment of the amount of dissolved substances in water in ppm units. It is a practical tool for water quality control at home, in aquaristics, and wherever a water filter, water filtration system, osmosis filter, reverse osmosis filter, or reverse osmosis is used. The compact housing, large LCD display, HOLD function, automatic shut-off, and the ability to perform manual calibration make the meter convenient for both everyday checks and periodic measurements.
Precise and fast water quality control
The HM Digital TDS-4 is the successor to the TDS-EZ meter and is among the smallest and lightest TDS meters available. Its slim, rounded, cylindrical design sits comfortably in the hand, and the handy clip placed in the cap makes the device easy to carry and use every day.
The meter is used to measure the total amount of all dissolved substances in water. This makes it easy to quickly check water condition and compare results between successive measurements. It is a useful solution for monitoring utility water and for tracking the operation of water treatment devices.
Key advantages of the TDS-4 meter
- 10-minute auto-off battery-saving function,
- hold memory function,
- large, easy-to-read LCD display,
- factory-calibrated meter,
- manual calibration possible with a mini screwdriver,
- 3-year warranty.
Convenient operation and practical features
The device is equipped with a HOLD temporary memory function, which allows you to save a reading for later viewing. Saving is accompanied by an audible signal, giving the user clear confirmation that the operation has been completed.
If the properties of the tested water do not change for 3 minutes, the device stops operating. In addition, to save battery power, the meter automatically turns off after 10 minutes of inactivity.
The reading is shown within a practical range, and for results greater than 999 ppm the symbol [x10] appears on the display, making higher measurement values easier to interpret.
The meter is factory calibrated and ready to use. If needed, manual calibration is also possible using a mini screwdriver. To maintain repeatable results, it is recommended to take measurements in a clean container and to protect the sensor with the cap after use.
Build quality and quality control
Each TDS-4 meter undergoes quality control, confirming compliance with the quality criteria defined in standards. This inspection provides assurance that the manufactured parts, applied components, materials, and systems meet the required quality standards.
The QC inspection includes actual measurements, tests, or supervision of the product's manufacturers through inspections of subsequent project stages or sample testing. In practice, this translates into greater operating consistency and reliable use.
Application of the TDS meter
The HM Digital TDS-4 is suitable wherever quick water parameter control is needed. It is useful for domestic water quality assessment, monitoring the operation of water treatment systems, and checking devices such as a reverse osmosis system or water filter. It is also a convenient solution for users who want to regularly compare water readings before and after filtration.
For wholesale purchases of 10 units or more intended for resale, it is possible to replace the packaging with a version designed specifically for aquaristics.
Dimensions
- width: 2.3 cm,
- length: 14 cm,
- thickness: 1.5 cm.
Set contents
- TDS-4 Meter,
- sensor cap with clip,
- two batteries (installed),
- blister packaging,
- manual.
Additional important information
- 2.3 cm
- 14 cm
- 1.5 cm
Technical specifications
| Model | HM Digital TDS-4 |
|---|---|
| Device type | Pocket TDS meter |
| Measurement range | 0-9990 ppm |
| Display reading | For results greater than 999 ppm, the symbol [x10] appears |
| Resolution from 0 to 999 | 1 ppm |
| Resolution from 1000 to 9990 | 10 ppm |
| Measurement accuracy | +/- 2% |
| Factory calibration | Yes |
| Calibration solution | NaCl 342 ppm |
| Manual calibration | Yes, with a mini screwdriver |
| HOLD function | Yes, with audible save signal |
| Automatic stop of operation | After 3 minutes if the properties of the tested water do not change |
| Auto-off | After 10 minutes of inactivity |
| Display | Large, easy-to-read LCD |
| Power supply | 2 x 1.5V button batteries |
| Battery life | 1000 hours of operation |
| Weight without packaging | 32 g (1.13 oz) |
| Housing shape | Rounded, cylindrical |
| Dimensions | 2.3 cm x 14 cm x 1.5 cm |
| Warranty | 3 years |
FAQ
What is the HM Digital TDS-4 meter used for?
The device is used to measure the total amount of dissolved substances in water. The result is given in ppm, which makes it possible to quickly assess water quality and compare measurements at different times of use.
Is this meter suitable for checking water after filtration?
Yes, the TDS-4 is very useful for monitoring the performance of devices such as a water filter, osmosis filter, reverse osmosis filter, or reverse osmosis system. It makes it easy to compare water quality before and after filtration.
What is the measurement range?
The measurement range is from 0 to 9990 ppm. For values above 999 ppm, the symbol [x10] appears on the display, helping to correctly read the higher result.
Is the meter ready to use straight out of the box?
Yes, the meter is factory calibrated and supplied with batteries installed, so you can start using it immediately after unpacking.
Can I calibrate it myself?
Yes, the device allows manual calibration using a mini screwdriver. It is factory calibrated with NaCl 342 ppm solution.
How does the HOLD function work?
The HOLD function saves the current reading so it can be viewed later. Saving is accompanied by an audible signal confirming that the reading has been recorded.
Does the meter turn off automatically?
Yes, the device has an auto-off function and automatically turns off after 10 minutes of inactivity, which helps save battery power.
What batteries are needed for power?
The meter is powered by two 1.5V button batteries. Estimated battery life is about 1000 hours of operation.
What is included in the set?
The set includes: a TDS-4 Meter, a sensor cap with clip, two batteries installed at the factory, blister packaging, and a manual.
Product Details
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HM Digital TDS-4 is a compact, lightweight TDS meter for quick assessment of the amount of dissolved substances in water (ppm). It offers a HOLD function with an audible signal, a large LCD display, and automatic shut-off after 10 minutes of inactivity. The device is factory calibrated and allows for manual calibration with a mini screwdriver. Measurement range is 0-9990 ppm.