Paper chart recorders must routinely be replenished with paper and ink, incurring significant material and labor costs. U.S. company Monarch Instrument's range of paperless recorders eliminate paper charts by displaying data on a high resolution, 127mm LCD display, and by storing the data on 89mm floppy disks or PCMCIA memory cards. The company also offers portable, contact/non-contact tachometers, portable and machine vision stroboscopes, complete with sensors. The products have CE marking.