R r electronics offers a range of test and measuring instruments. Digital counter, model dc-6642c comes with the following specifications: display - 6-digit, 7-segmented red led display 0.5" heigh; supply voltage - 220v ac ± 15%; sensor - impulse from supply voltage; memory backup - 24 hrs [2 months optional]; panel cut-out - 128 x 58 mm. Applications: production counter for power presses, moulding, form fill, sealing, printing machines, process plants; and length counter for paper plants, cloth mills and extruders.