It would be better if the lines were longer or darker every inch, like 1/2 and 1/4 inches. It is very difficult to measure anything. I used Sharpie to make the markings. Good if you just need to draw lines or need a ruler.
Laser pointer Green Laser 303
31 Review
Thickness gauge CarSys DPM-816 PRO (Fe/nFe)
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35 Review
Laser level Zitrek LL1V1H
36 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
Digital multimeter RGK DM-12
π§ UEi Test Instruments DAFM3B Digital Multimeter