Pensize ORP Tester -1200~1200mV with ORP Calibration Buffer Powder for Water Quality Measurement ±2mV High Accuracy Oxidation Reduction Potential Meter

The meter is inaccurate. The number is constantly increasing or decreasing, even after 5 minutes of sitting in a water sample (the included literature says it should only take 1-3 minutes to reach a reading).The calibration does not hold. I calibrated the ORP meter following the instructions. Then, I tested a couple waters. I then rinsed it with distilled water, dried it off, and put it back in the calibrating solution only to find out it had since dropped its reading by 20mV.Save your money, get something else.

還元くん水素茶用に購入素人なので良し悪しはわかりませんが測定できました。メンテナンスが素人にはわかりづらい。使用後は純水で濯ぐ。電極が汚れたら付属の粉を溶かして浸けるらしい。正しく反応しているかどうかを確認するためでもあるらしいが１袋しか入ってませんでした。別売あり。