Graphic Pens & Charts > graphic pens & charts for Barton meters and Recorders. We have Graphic pens in many sizes, & colors also Graphic Charts with a variety of pressures,Temp. and differential for your measurement needs. Call our offices and you will never be sent to voice mail or to a never ending electronic phone system maze. On the contrary, McKinney Measurement is a friendly business that strives to offer the very best service in the oil & gas, measurement & control industry. So for all your graphic pens & chart needs rely on our friendly, professional, and experienced staff to help you. We offer great prices & inventory on Graphic Pens & charts. We proudly carry all color pens, and a variety of charts with pressure, differential and temperature in stock for your gas measurement needs. If you would like more information about our inventory of graphic pens & charts, please call or e-mail us. Continue on to the rest of our website, where you will find more info about our stock of graphic pens & charts and more. If you have questions or need help with any of our graphic pens & charts, please feel free to give us a call, we will be more than happy to help you.