Frequency counters and universal counters are products that are used in measuring frequency.
Universal Counter
U9000A/U3000A – Cost effective product. High reliability, high performance. Equal accuracy measure technology applied that enables high resolution to display 8 digits/s. Option IEEE-488 interface can be remotely programmed and measurement results can be output to IEEE-488 compatible instrument or computers. VFD display with big characters. Printer interface equipped.