Enhance your space and give your students a resource to remember how to tune their instruments! Teaching students is all about giving them tools to figure things out for themselves and enforcing techniques to encourage students to remember! This simile has stuck with me into my professional career, but is so simple that a beginning player can relate to it.
The arrows on the poster allow the student to relate their playing to a tuner.
Print the PDF as is or upload it to a printing service site such as VistaPrint to make a full size, glossy poster.