Sanyi PH TDS Meter, 4 in 1 Digital Water Test Pen 0 to 14.00 PH and 0 to 9999 PPM Measure Range for Drinking Water, Hydroponics Aquariums, Swimming Pools

Both meters are very accurate. I have been using them to monitor the ph and ppm in my fish tank. I calibrated the ph meter with the included calibrating salt diluted in distilled water and it was ready to go. The meters are easy to use and accurate, I have been getting accurate readings as I double check the ph and ppm before and after dosing my aquarium with fertilizer. The ppm meter even measures the temperature which is very nice and also very accurate. I compared the temp on the ppm meter to my basic glass thermometer and it was spot on. The led display on the meters is easy to read as the screen is large and has good contrast.

Items came well calibrated and very easy to use. Please remember to not fully submerge them.

Great for the money. I need to order more calibration solution after about 6 months of frequent use. But pretty accurate. The only complaint I would have is there is not a way to calibrate the ppm meter. But for the price I should be happy with it's accuracy. The ph meter is great. Definitely recommend.

I mainly got this kit for the PH meter, since I already had a TDS meter. But I thought it might be good to have a second TDS meter that I can keep with me when I travel, to test the quality of water in hotels or other places where I might stay. I am using both meters to test the water from my reverse osmosis water filter at home. My filter has a module which adds minerals back to the water and is supposed to make the water more PH neutral (Most water from RO systems has a PH closer to 0, which is very acidic). So far both meters seem to be fairly accurate. The TDS meter is within 10% of the number I get from my other meter. And when I measure the RO water and compare it to water that I know is neutral, the readings are close. Although the best PH meters are well over $100, I think this one does a good enough job.

Barely worked on arrival (ph). Broke with in first month. However, the TDS meter that came with is one of the best Ive had.

This ph pen is does not work. It will not auto calibrate. Thinks 6.86 buffer is 4.1. Can’t do Anything to change it. Quality control is not there with this company, I guess.

The ph meter was crap but the ppm was great.

This is a very good product. I can use it to test the quality of water. I can judge the water quality of my fish tank or swimming pool. I love this product.