Digital pH meter with calibration kit

About the product and its use

Vinea yellow pH meter for testing nutrient solution in hydroponic growing. The model pictured has a CAL button for automatic calibration; no calibration screwdriver required.

Specifications and contents

Measuring range

0.00–14.00 pH

Display resolution

0.01 pH

Nominal accuracy

±0.01 pH; calibration at only 6.86 point indicates accuracy of 0.1 pH

calibration

Automatic calibration with CAL button; points 6.86, 4.00 and 9.18 according to model instructions

Working temperature

0–60°C

Batteries

2 1.5V LR44 batteries

Dimensions and weight

155×31×18 mm; approx. 50 g

What is included?

pH meter, black lid, box and three bags of calibration powder: 4.01, 6.86 and 9.18

Assessment contents

Included are a meter with lid, box, and three calibration bags. Powders for continued use are also sold separately.

Calibration and usage instructions in Hebrew

1. Prepare each sachet of powder separately with 250 ml of distilled or deionized water, in a clean container. Mix until completely dissolved. The reference values of the sachets are 4.01, 6.86 and 9.18 at 25°C.
2. Turn on the meter, remove the lid, and rinse the electrode with distilled water. Immerse only up to the dip line, without wetting the meter body.
3. Start with solution 6.86, preferably around 25°C. Press CAL for about 5 seconds and release. Wait for the flashing to stop; when finished, three flashes appear.
4. Rinse the electrode. For acid calibration, immerse in solution prepared from bag 4.01. The meter displays 4.00 at this point: Press CAL for about 5 seconds, release, then press again briefly to select the point. Wait for the flashing to stop.
5. For calibration in the basic range, proceed to solution 9.18, after rinsing, according to the calibration chart attached to the model. Do not substitute the sequence of operations with instructions for another model.
6. Check the reading again in a clean solution. If an ERR appears or a value does not stabilize, check the solution, batteries, and electrode and repeat the calibration.

Important to know before use

• Measure after mixing the nutrient solution and wait for the reading to stabilize. Adjust the pH target for growth and fertilization, not a uniform value for all plants.
• The meter is not intended for full immersion. Rinse gently after use and replace the cap.
• To store the electrode, use an appropriate storage liquid and follow the model instructions; do not store for long periods in distilled water.
• A pH 7.00 solution is not the same as 6.86. For this meter, use the calibration points listed on the instruction sheet.

Complementary equipment and correct selection

Set of three pH calibration powders – 4.01, 6.86, 9.18 · All gauges and calibration accessories

For expansion: Acidity and pH on the Hebrew Wikipedia.

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