Can calibration be achieved with just one (7.0 pH) testing solution?
2090854
Yes and no. You can get it close with only 7.0 but for more accurate reading you need 4.0 and 10.0 or ph test strips (paper test strips)
1049007
Youre right, the PH range is 0-14. the picture reads 18.3 because the meter was turned on without being submerged in anything.
346322
To calibrate, use distilled water. You set the device to zero and thats all. You should do this once every three / four months.
1630630
FROM HM DIGITAL: The accuracy of the PH-80 is + / - 2%. It is factory calibrated to pH 7.0. The meter can be easily re-calibrated with digital calibration to pH 4.0, 7.0 or 10.0. All pH meters should be calibrated anywhere from before every use to at least once a month. The frequency of calibration depends on usage and application, but you should calibrate at least once per month for proper results and a longer lifespan of your meter. A free packet of pH 7.0 buffer is included with the meter. Additional pH buffers for calibration are available for purchase. For more information, please visit www.tdsmeter.com/products/ph80.html FROM HM DIGITAL: The accuracy of the PH-80 is + / - 2%. It is factory calibrated to pH 7.0. The meter can be easily re-calibrated with digital calibration to pH 4.0, 7.0 or 10.0. All pH meters should be calibrated anywhere from before every use to at least once a month. The frequency of calibration depends on usage and application, but you should calibrate at least once per month for proper results and a longer lifespan of your meter. A free packet of pH 7.0 buffer is included with the meter. Additional pH buffers for calibration are available for purchase. For more information,... » Read More FROM HM DIGITAL: The accuracy of the PH-80 is + / - 2%. It is factory calibrated to pH 7.0. The meter can be easily re-calibrated with digital calibration to pH 4.0, 7.0 or 10.0. All pH meters should be calibrated anywhere from before every use to at least once a month. The frequency of calibration depends on usage and application, but you should calibrate at least once per month for proper results and a longer lifespan of your meter. A free packet of pH 7.0 buffer is included with the meter. Additional pH buffers for calibration are available for purchase. For more information, please visit www.tdsmeter.com/products/ph80.html « Show Less
544284
Yes, I have. It is off a considerable amount, given the nature of food safety. Food pH that is acidified or low-acid needs to be less than 4.6pH. However, I tested samples that I sent in for laboratory measuring and it's off by approx. .06. It doesn't sound like a lot, but it is. For example, I sent in two samples that I measured with this instrument at 4.42 and 4.31. The lab measured them at 4.48 and 4.37, respectively. The lower number I sent (4.31) them wasn't ideal for my purposes because of amount of food acid I had to add, but I sent it in as a cross-check for my new meter. They wouldn't accept 4.48 as low enough (I realize its lower than 4.6pH, but that seems to be another issue at work here). While I can probably work with the inaccuracy, as long as it remains consistent, I don't have much confidence in this meter. As a side note, I calibrated the meter fastidiously, several times between measurement with both 4.0 and 7.0 calibration fluid. My assessment at this point is to return the item, if possible.
1963535
This product is capable of testing the ph of your lawn, but I would use a ph tester that had smaller increments of the ph level (as in fractions or decimals).
2201719
Yes. Use RO or drinking water and run threw zero water filter. PH up to 7.4 using ph meter to verify.
1667330
It does not need calibration but you must let it stay in soil undisturbed for minimum of 5 minutes until it displays final PH reading and the PH range is less than 5 and above 7
501126
They only give you enough for a one time calibration. You will need to buy the appropriate storage solution. A little goes a long way.
216130
Mine did come with the two calibration packets, but I purchased General Hydroponics Standard Reference Solution when I ordered the unit. I used that to calibrate it when it came and found it to be exactly 7.0. Would recommend getting the extra solution.
1777385
No calibration required. Just keep the test tubes clean. Works great by the way.
2040919
I get around 700. The package says 1500. The measure is taken with a solution that I made about a week ago (unused, of course) since I don't trust the result if I measure the solution's ppm right after I mix it since there is a lot of solids that you can see with your bear eyes even two days later. To make matter worse, I do have a PH meter but I did not order the standard solution which would allow me to calibrate it at this precise point. I don't know if the solution will measure to 1,500 once I add more particles lowering or raising the PH.
1630628
we have been very happy with our pH tester. It needs to be calibrated occasionally but for the most part stays in calibration fairly well. It's easy to recalibrate and easy to use. We are happy with the tester
1491488
For correct cyanuric acid (stabilizer) reading, the ph and alkalinity will need to be within range.
2112109
The one I received was pretty close about 0.2 if I remember correctly. It is not really an issue though as it comes with chemicals to mix calibration solutions. You just need to mix it with distilled water.
1777383
I saw no way to calibrate it, and contacted the manufacturer when my chlorine reading was way off. They did not mention calibration. I tried 2 kits and gave up after my chlorine reading was way off on both.
2240239
No calibration needed, although it is always a good idea to test when you have not had any alcohol to make sure it reads zero at that time. Remember, it is not meant to be as accurate as the equipment used by the sheriffs. It is a way to keep yourself in check when you are out drinking.