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I agree with the OP. I fill mine with known 10ml and it is absolutely above the line. I also have a quick question regarding the phosphate test. After you put the powder in, or at least as much as you can get from the stupid packet lol. You have to mix for 2/3 mins till its all dissolved then press button to start countdown. Problem is the checker has turned off
by itself and when I hit the button it wants to start over with the C1. What am I doing wrong here? Do you hold the button down? Eric
The phosphate test has a very specific window of time for the chemical reaction to take place. This autoshut-off prevent over mixing of reagent that might throw off the reading.
1. Prior to turning on your meter, fill the cuvette with 10 mL of unreacted sample and replace the cap. Cut open one packet of HI 713-25 reagent and set aside.
1. Turn the meter on by pressing the button. All segments will be displayed. When the display shows “Add”, “C.1” with “Press” blinking, the meter is ready
3. Place the cuvette with 10ml of unreacted sample into the meter and close the meter’s cap.
4. Press the button. When the display shows “Add”, “C.2” with “Press” blinking the meter is zeroed.
5. Remove the cuvette from the meter and unscrew the cap. Add the content of one packet of HI 713-25 reagent. Replace the cap and shake gently for 2 minutes until the powder is completely dissolved. Place the cuvette back into the meter.
6. Press and hold the button until the timer is displayed on the LCD (the display will show the countdown prior to the measurement) or, alternatively, wait for 3 minutes and press the button.
7. The instrument directly displays the concentration of phosphate in ppm. The meter automatically turns off after 2 minutes.