Frequency Counters

Frequency Counters

Frequency counters are counting devices that measure frequency, or the number of occurences or electrical signal.
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Counter-Pen/Colony-Counter 
Product Type: Counter Pen. Display Type: LCD. Description: Exhausted batteries should be replaced with a number 392 silver oxide battery. Displayed Text: 99,999.
Counter-Pen/Colony-Counter 
Product Type: Counter Pen. Display Type: LCD. Description: Exhausted batteries should be replaced with a number 392 silver oxide battery. Displayed Text: 99,999.