General Hydroponics Ph 4.01 & Ph 7.0 Calibration Solution Kit, 8 oz

Great calibration solution so far. Arrived on time, colors are a huge help and seems to be very accurate as advertised.Best advice I can give others with this is that you don't EVER want to dip your devices directly into these bottles to calibrate, as you will instantly contaminate the solutions and will have wasted your money (no matter how hard you try to avoid it). Instead ALWAYS pour a little amount of each solution into separate containers (shot glasses work well heh) and dip said device(s) into these separate containers to avoid contamination or original solution sources.General Hydroponics, if you are listening to this, the only design change I would like to see on this produce is to maybe add a tiny dent to the lip of the bottles cap. The surface tension of the bottles material creates a stream of solution that does not pour out well, and a little dent creates a spout effect or pouring much easier and the user's experience with product much nicer.

Very good it calibrated ph meter quick

Works just the way it should... lasts forever if you use small amounts each time you calibrate. Has kept my meter running accurately! Thanks.

Consistent and accurate, will buy again

Just a heads up. Does what it says on the tin. I still gave 5 star because its not their fault I impulse shop while tipsy.