TWTADE/Infrared Wireless Visitor Counter 110-220VAC LED Auto Display Digital Counter 0-999999 6 Digits count Mall people flow + Photoelectric Switch Sensor distance 2m NPN NO + Reflector + holder
from $33.99
Crystal Oscillator Frequency Counter Tester Meter, DIY 1Hz-50MHz Frequency Indicator Crystal Oscillator Tester Module Kit with 5 Digits Digital Tube Display Red
from $9.87
KOOBOOK 1Set 1Hz-50MHz Frequency Counter Meter Crystal Oscillator Digital Tester Meter DIY Kit 5-Digital LED Display
from $6.99
Liyafy 1Hz-50MHz Crystal Oscillator Tester Frequency Counter Tester Measuring Meter Case Durable DIY Led Kit
$13.99
from $11.08
DIY Frequency Indicator Kit 1Hz-50MHz Crystal Oscillator Tester Module Kit with 5 Digits Digital Tube Display
from $10.58
More results from Amazon »