Mayata 3PCS/4PCS 15cm 20cm 25cm 30cm Multifunctional PCB Ruler Measuring Tool Resistor Capacitor Chip IC SMD Diode Transistor Package 180 Degrees (4pcs/lot)

Love these. They are great.. the info printed on them is so handy for designing pcb's and referencing smd package footprints. Love them

Great idea.

This four piece ruler set is an ingenious idea. Has just about every possible measurement and SMT component ID imaginable. Only flaw I see is the wording overlaps in some places and a couple grammatical errors. Other than that, perfect.

Very nice displays.

I've used these things a TON, they have so many useful measurements.

I purchased them for my grandson currently at Michigan Technological University. Hopefully this helps reduce math test stress.

These are the coolest rulers I've ever seen, really helped me quickly lookup and replace specific SMDs I didn't know the part number of.

The one initial impression when shopping for one of these is that it shouldn’t news 4 rulers to contain the info most want. Surely one ruler can contain the pad spacing and sizing for the SMD package range as well as spacing and trace thickness metrics. But no, it’s spread needlessly over 4 rulers.Trouble is the space just isn’t used well. Some rulers have lots of empty space that could have been used to fit this all on way less rulers (maybe 2) , while other areas clearly no one bothered to check as text overlaps itself and covers up actual measuring info with aphorism text. Really folks?Then the general advice to carefully look for damage as my first order hab one ruler whose edge had suffered a sharp impact that split the board layers , maybe a board defect but certainly got past any QA. See pics.