Description
Keep track of your water over time!
With this meter with Smart WIFI APP you can measure:
| Measurement value | What is being measured+ |
| pH | Acidity - Below 7 is acidic over basic |
| ORP | If the liquid is oxidizing or alkaline. Target value 250-400 |
| EC | The amount of nutrients (nutrition) |
| TSI | Dissolved solids in water (pollutants) measure the quality of drinking water |
| RH% | Relative humidity in the room |
| CF | The amount of salts in the water. (same as EC*10) |
| Temp | Water temperature, can be displayed in Celsius or Fahrenheit |
Download the "Tuya" APP, with WiFi connection, you can view current data, historical data, abnormal high and low values, and set alarms on your mobile phone, etc. Connect to your phone in seconds, you can get PH, ORP, EC, PPM, CF, humidity and TEMP values. This makes testing more accurate and convenient.
Easy to use: All measurements are taken simultaneously, with the electrode in the water you get quick answers on the LCD screen.
Backlighting is supported for easy reading even in low light.
Convenient with an APP: Record data for a long time, easy to compare and analyze and find causes/solutions.
If you have problems that you don't understand the cause of or want to maximize your results, this meter is worth its weight in gold. The Swedish manual includes a list of values that different crops thrive best in.
PH Value
The correct pH value is important for your plants to feel good and absorb nutrients in the best way.
The EC value shows how much nutrient is in the water. Some plants are hungrier than others and consume more nutrients than water, and some become overfed if you add the same amount of nutrients each time. With this meter you don't have to guess.
The neutral PH value is 7.0. Most plants thrive best between 5.2-6.5.
| Crop | Ideal pH value |
|---|---|
| Salad | 5.5-6.5 |
| Tomato | 5.5-6.5 |
| Cucumber | 5.8-6.0 |
| Pepper | 5.8-6.2 |
| Basil | 5.5-6.5 |
| Strawberries | 5.5-6.5 |
| Broccoli | 5.5-6.5 |
| Cabbage | 5.5-6.5 |
When growing hydroponically, it is important to keep track of the EC value, especially how it changes. The EC meter is a way to measure how much nutrients and water your plants are taking up. If you have an EC starting value, you can check after 1-2 days how much nutrition and water your plants are drinking. If the EC value drops, the plants are drinking more nutrition than water and then you need to add more nutrition. If the EC value rises after 1-2 days, the plants need more water.
Also keep an eye on the color of the leaves. If the plant turns dark green and the leaves become burnt at the ends, it is a sign of too much nutrition (too high an EC value) and you need to add more water.
If the plants are too light in color, the cause is often too little nutrition (too low EC). Is the pH value correct? (too high or low prevents the plant from absorbing nutrition) then add more nutrition.
ORP Value
In hydroponic growing, a good ORP (oxidation-reduction potential) value is between 250 mV and 400 mV. This ensures that the nutrient solution remains clean and free of harmful pathogens while maintaining beneficial microbial activity.
Recommended ORP values for hydroponics
| ORP value (mV) | Effect in hydroponic cultivation |
|---|---|
| Below 200 mV | High risk of anaerobic bacteria, algae and root rot. Poor oxygenation. |
| 250 - 400 mV | Optimal range: promotes healthy growth, prevents disease and maintains oxygen balance. |
| 400 - 600 mV | Increased sterilization effect, good for killing pathogens but can reduce beneficial microbes. |
| Above 600 mV | Too high: Can damage roots and beneficial bacteria. Excessive oxidation from chlorine or ozone. |
Why is ORP important in hydroponic growing?
- Prevents Root Rot & Pathogens – An ORP above 250 mV helps control Pythium (root rot) and other harmful microorganisms.
- Ensures oxygen availability – A good ORP value indicates high dissolved oxygen (DO) , which is crucial for healthy roots.
- Keeps algae away – ORP below 200 mV can lead to stagnant water where algae grows.
- Optimizes nutrient uptake – Too high an ORP (above 500 mV ) can break down certain organic nutrients and disrupt the balance in the solution.
How to maintain a good ORP in hydroponics
✅ Use hydrogen peroxide (H₂O₂): Small doses (3-30 ppm) increase ORP and kill pathogens.
✅ Good oxygenation: Air stones, oxygen pumps or vortex systems can naturally raise ORP.
✅ Regular water changes: Helps keep ORP stable and prevents nutrient buildup.
✅ Monitor pH & EC: ORP works best when pH and EC are adjusted to the needs of the plants.
Good TDS value for hydroponic cultivation
TDS ( Total Dissolved Solids ) is measured in ppm (parts per million) and indicates the amount of dissolved nutrients in the water. A good TDS value in hydroponics depends on the type of plant you are growing. TDS is another way to measure EC.
TDS Value
Recommended TDS values for different plants
| Plant type | TDS (ppm) |
|---|---|
| Salad & leafy greens | 560 - 840 ppm |
| Tomatoes & peppers | 1400 - 3500 ppm |
| Cucumber | 1190 - 1750 ppm |
| Strawberries | 560 - 1260 ppm |
| Basil & herbs | 560 - 840 ppm |
| Cabbage, broccoli & cauliflower | 1400 - 2100 ppm |
How to Adjust TDS in Hydroponics
- TDS too low → Add more nutrient solution.
- Too high TDS → Dilute with clean water.
- Monitor pH → Keep it within the correct range (usually 5.5 - 6.5 ).
TDS and EC (Electrical Conductivity)
If you are using an EC meter, you can convert between EC and TDS:
- 1 mS/cm (EC) ≈ 500-700 ppm (depending on conversion scale).
- EC is often used more accurately than TDS in hydroponics.
With a meter you don't have to guess and can understand if it's not growing properly.
It comes with three bags of Buffer Powder. With these you can easily mix into calibration fluid to calibrate your meter. If you need more calibration fluid, you can buy more bags here
