Horiba Scientific now has a line of compact water quality meters. These LAQUA twin meters can measure different water quality values including pH, conductivity, sodium, potassium, nitrate, calcium, and salt. They feature an easy to read digital LCD display that lights up when the measurement is complete. They are water and dust proof, and include sensor guards to protect the sensor when not in use. Their flat sensors allow for six methods of sample measurement including immersion, scoop, drops, solid samples, powders, and papers and textiles. Their dimensions are 164 mm x 29 mm x 20 mm, and they have a weight of only about 50 grams (excluding batteries). The meters take 2 CR2032 batteries which are included, and have 400 hours of battery life while in use. They automatically shut off after a period of disuse to save battery time. The meter is mainly made of ABS epoxy. The meters come with a pipette, an instruction manual, a storage case, and standard solution. All meters, apart from the conductivity meter, come with 5 pieces of sampling sheet. They can operate in 5 to 40° C (41 to 104° F) and 85% or less humidity. The meters work quickly to get accurate results.
Replacement sensors are available for purchase so you do not need to replace entire meters. Additional standard solution, sampling sheet pieces, and sampling sheet holders are also available.
How to Use
To turn the water quality meters on, press the power button and hold for at least 2 seconds. Before performing measurement, you should calibrate your meter. To do so, pour the 2,000 ppm standard solution onto the sensor, close the light shield cover, and press the CAL button and hold for at least 2 seconds. When “CAL” and a smiley face are displayed on the screen, the calibration is complete. You should then clean the sensor with water. Then, press the MEAS button to enter measurement mode. To get a measurement, pour a few drops of your sample onto the sensor, and close the light shield cover. When the smiley face lights up, the measurement is complete. Press the MEAS button to lock the measurement. After use, clean the sensor with water and dry, and turn off the power. Be sure to close the light shield cover before storage.
How to Replace the Sensor
To replace the sensor, start by lifting the sensor tongue tip and sliding the sensor away from the meter. Then, pull the sensor completely away from the meter. Next, check to make sure the waterproofing gasket is clean and undamaged. After that, slide the new sensor onto the meter so that the catch “A” on the back of the meter fits into hole “A” on the sensor tongue. Be careful not to twist the waterproofing gasket during the replacement process. Also be sure that the sensor tongue is outside the meter case. If it is inserted between the case and the connector, it might damage the connector. When removing the old sensor, do not let any water get inside the meter. If water does get on the waterproofing gasket, gently wipe it away.
The pH meter can detect your tank’s pH in seconds with only a drop of water using the glass electrode method. It is essential to maintain proper pH in your tank because even small changes can drastically affect its inhabitants. This meter can detect pH in a range from 2 to 12, and is accurate to 0.1 pH.
The conductivity meter measures conductivity, salt, and TDS with only 0.12 mL of water necessary. Testing your tank’s conductivity helps to make certain there is proper salinity. This conductivity can be detected in a range of 0 to 19.9 mS/cm. Salt levels can be detected in a range of 0 to 1.1%. TDS levels can be detected in a range of 0 to 9900 ppm.
The sodium ion meter uses the ion electrode method to measure levels with 0.3 mL of water. It can detect a range of 23 to 2300 ppm, and is accurate to 10% of reading.
The potassium ion meter also uses the ion electrode method with 0.3 mL of water. It can detect a range of 39 to 3900 ppm, and is accurate to 10% of reading. Potassium is important for aquarium plants and corals.
The nitrate ion meter also uses the ion electrode method with 0.3 mL of water. There are 2 special versions of this meter available for use with crops and soil. The basic model can detect a range of 62 to 6200 ppm. All 3 models are accurate to 10% of reading.
The calcium ion meter also uses the ion electrode method with 0.3 mL of water. It can detect a range of 40 to 4000 ppm, and is accurate to 20%.
The salt meter measures NaCl concentration using the ion electrode method with 0.3 mL of water. It can detect a range of 0.1 to 10%, and is accurate to 10% of reading.
Maintaining proper water quality is essential to the health of aquarium inhabitants. Horiba Scientific’s LAQUA Twin meters makes it easy to measure these values and ensure they are at safe levels.
Compact water quality meter LAQUA Twin. Horiba Scientific. Retrieved from http://www.horiba.com/laquatwin/en/lineup/index.html#top1.
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