From Sundials to Atomic Clocks: Understanding Time and Frequency, Second Revised Edition
from $7.01
Portable Digital AM FM Stereo Radio FM/AM/SW/LW/TV Sound Digital Tuning Full-Band Radio Receiver with Alarm Clock, Radio AM FM Portable Radio SW Petite with Mute State/Frequency Lock (Step Value 10k)
$18.11
from $14.58
Teyleten Robot Si5351A Si5351 5351 8KHz -160MHz High Frequency Signal Generator Breakout Board DC3.3-5V Square Wave Frequency Generator Board Module I2C for Arduino (3pcs)
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Portable Radio, FM/AM/SW/LW/TV Pocket Radio Sound Full Frequency Receiver Receiving Radio Alarm Clock(Black)
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ESP32 3D Printer Motherboard 32 Bit, 240MHz Clock Frequency 8M Byte Flash Memory 3D Printer Control Board for Serial Screen
from $29.99
TimeMoto RF–110 RFID Key Fobs, Set of 25, Compatible with TimeMoto Employee Time Clocks, Compact, Lightweight, 125 kHz Frequency, 2.8in Detection Distance, 30-Day Satisfaction Guarantee
from $69.00
HiLetgo Si5351A I2C 25MHZ I2C High Frequency Signal Generator Breakout Board Square Wave Frequency Generator Signal Generator 8KHz to 160MHz 3-5VDC
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Pocket Radio, AM FM Personal Mini Radio with Headphones, Walkman Radio with Rechargeable Battery,Memories Personal Radio for Sport & Running Walking, LED Display 70 Stations Grey
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AM FM Pocket Radio Portable SW/LW/TV Sound Full Frequency Receiver with Clock and Alarm (Type 1)
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The Quantum Beat: Principles and Applications of Atomic Clocks
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