For sure man. I have found that quality paper test strips are accurate and easy to use with mixed dark nutrients. I spent years with blue lab pens and calibrated them for people at my job. They just aren't that reliable for the average home grow with the kinds of liquids people use them in and the lack of calibration etiquette. Just my 2 cents trying to save you some $ and time. The strips give you a darn near instant reading too!