i have a beltone model 119. works just fine. vision I also just use a snellen chart. I do have a Titmus, but honestly, it's just faster to screen the masses using the chart. If i have concerns I can drag out the machine.
For hearing I use the Maico MA1. I have a regular size MA39 or 40 but the MA1 is awesome because it's very concise and great for travel between my schools. MA 1 Conduction Audiometer
For vision I have an iPad and use the Near/Distance Vision Screening & Testing app by Good-Lite. I love it. Near, far vision testing with different optotypes that I can use for any grade/reading/comprehension level. At one of my schools I have a really small office so I use my wall Snellen chart. However, I have a bunch of different rolls of electrical tape that are different colors. I placed a different color piece of tape under each line. It's much easier to tell my students to read above the blue/orange/green line then say the 2nd/5th line or point. https://itunes.apple.com/us/app/near...9043?ls=1&mt=8
The NASN School Nurse publication Vol 26 Number 4 (July 2011) has a review of distance vision screening eye charts and recommends Sloan letter charts as meeting national and international eye chart design guidelines. LEA symbols are recommended for children age 3,4,5, and 6 if still in kindergarten.