I have worked with precision meters so when I looked at many digital PPM/TDS/PH meters I wasn't surprised to see quality material just under 200.00. That's consumer quality, not lab quality, but close to it. Everything you would expect in terms of procedures and cleaning applies to all test equipment, expensive or not. I thought what the heck, find a good cheap one that has good reviews and see for yourself. I bought this handy meter for less than $20.00. Unpack the PH/PPM meter and pour about 1 inch of distilled water to remove any manufacturing oils, simple glue, and fingerprints. I dried it whole and wiped the sensors with a napkin. Went out and took three samples from the pool. One for a chemical test, one for a Revain PH/PPM meter and one for a lab PPM/PH temperature coefficient meter. Watercolor gave me the green light to swim, but your guesses. The PPM in question immediately lit up, dropped to zero and I adjusted it to about 1 1/2 that of the pool water and it read 7.35. I have a $500 tester and I'm holding onto your hat, they both show 7.35 or 7.3599 on a good, more decimal reading of the offset characters. In general, I know my exact pH is 7.3599 or 7.36. I think it's close enough for a missile operation. Next I have it! I took digital sensors and for lack of words just put glass electrodes in distilled water for 5 minutes, twisted slightly and removed. Dried to this point and left standing vertically to dry out any remaining moisture. Came back after drying and ran a handy dandy under $20.00 PPM/PH to read 0000. It is reed calibrated so there is no need to mix 3 250mL solutions to get started with this. Good to get out of the box. The key to the longevity of cheap, fragile equipment is moisture protection, cleaning with distilled water, and thorough drying. What impressed me the most was that this PH pen used pretty good quality glass sensors. This is my best advice, also don't drop it on a harder surface than non-commercial carpet. I highly recommend these devices. I also used a TDS (Total Dissolved Salts) meter and it's pretty good too. As with most older TDS meters, the probes are made of metal and will wear and corrode over time. Clean them in the same way. Can't handle tap water. Too much contamination and your gauges will go out of calibration almost immediately. A good product! 4 stars for use as I'm sure most people will be annoyed at having to clean up the mess. Negative reviews have made this difficult and should be addressed. Once you've received a working device, there's no more need to confuse yourself trying to calibrate it. Either it lights up and jumps to 0000 or it doesn't. If it gets stuck on a specific number, send it back. Purchase a gallon of distilled water to use. It will take years if you don't rob it to top up your disposable lead-acid car batteries.
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