Отзыв о 💧 Digital Water Quality Tester with Calibration Kit - LiZi pH Meter от Celina Krasnodebska ᠌

People, be careful! The calibration screw is located inside the tester, which can be reached with a screwdriver But the problem is that the screwdriver hole itself is at a completely different level relative to the screw You have to poke it diagonally there and look for this screw by touch, by touch because at this moment you should monitor the display with an indicator An even bigger problem is that this screw is located on top of some kind of board, and if you poke this board with a screwdriver, you can safely throw out the tester, and this moment will come sooner or later