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Search results for: 'Explain the difference between "hard" and "soft" water and how it is measured.'

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  1. EPC GEN2 uhf rfid writer module with TTL Interface Read range more than 15m connect with 12dBi anten
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    EPC GEN2 uhf rfid writer module with TTL Interface... SKU : CFMU903
    Special Price US$75.19 Regular Price US$83.54
  2. WiFi None Screen Face Recognition Access Controller
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    WiFi None Screen Face Recognition Access Controlle... SKU : WCAM101119340543
    Special Price US$57.92 Regular Price US$64.35
  3. USB Password Lock Security Biometric Fingerprint Scanner Reader Portable Safety Analyzer Universal f
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    USB Password Lock Security Biometric Fingerprint S... SKU : 32882129302
    Special Price US$19.00 Regular Price US$21.12
  4. JSJ N86-900 heightening thick bottom box 86 can be surface mounted and concealed module
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    JSJ N86-900 heightening thick bottom box 86 can be... SKU : 32731191484
    Special Price US$1.16 Regular Price US$1.29
    Out of stock
  5. Free Shipping Brand New USB Fingerprint Reader Scanner Sensor ZK4500 for Computer PC Home and Office
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    Free Shipping Brand New USB Fingerprint Reader Sca... SKU : 32811911702
    Special Price US$50.52 Regular Price US$56.14
  6. Gate Control Time Attendance Gate Face Recognition Machine Biometric Device
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    Gate Control Time Attendance Gate Face Recognition... SKU : WCAM101119340551
    Special Price US$85.56 Regular Price US$95.07
  7. Access Control Low Price Video Intercom RFID Card Face Recognition Access Control Device
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    Access Control Low Price Video Intercom RFID Card ... SKU : WCAM101119340549
    Special Price US$85.56 Regular Price US$95.07
  8. Long-Lived Mini USB Port Guard Tour RFID Reader with GPS Tracking System
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    Long-Lived Mini USB Port Guard Tour RFID Reader wi... SKU : 101015000015
    Special Price US$50.08 Regular Price US$55.64
  9. Mini USB Port Guard Patrol System with GPS Tracking System
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    Mini USB Port Guard Patrol System with GPS Trackin... SKU : 101015000014
    Special Price US$50.08 Regular Price US$55.64
  10. Long-Lived Mini USB Port Guard Patrol with GPS Tracking System
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    Long-Lived Mini USB Port Guard Patrol with GPS Tra... SKU : 101015000013
    Special Price US$50.08 Regular Price US$55.64
  11. Long-Lived Mini USB Port Security Systems with GPS Tracking System
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    Long-Lived Mini USB Port Security Systems with GPS... SKU : 101015000012
    Special Price US$50.08 Regular Price US$55.64
  12. Long-Lived Mini USB Port Guard Tour Equipment with GPS Tracking System
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    Long-Lived Mini USB Port Guard Tour Equipment with... SKU : 101015000011
    Special Price US$65.32 Regular Price US$72.58
  13. Wireless Sensor Mini USB Port Charge Security RFID Inspection Point Guard Tour Patrol with LCD Display
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    Wireless Sensor Mini USB Port Charge Security RFID... SKU : 101015000010
    Special Price US$67.41 Regular Price US$74.90
  14. Long-Lived Mini USB Port Guard Patrol System with GPS Tracking System
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    Long-Lived Mini USB Port Guard Patrol System with ... SKU : 101015000009
    Special Price US$12.34 Regular Price US$13.71
  15. Using Linux Operating System Temperature Detection Face Recognition System
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    Using Linux Operating System Temperature Detection... SKU : WCAM101119340629
    Special Price US$250.63 Regular Price US$278.48
  16. High Accuracy Access Control NFC Card Reader Facial Recognition System
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    High Accuracy Access Control NFC Card Reader Facia... SKU : WCAM101119340628
    Special Price US$250.63 Regular Price US$278.48
  17. Touch Screen Facial Recognition 64 Floors Elevator Access Control System
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    Touch Screen Facial Recognition 64 Floors Elevator... SKU : WCAM101119340554
    Special Price US$85.56 Regular Price US$95.07
  18. Free SDK uru 4000b Digital Persona USB Biometric Fingerprint sensor Fingerprint Reader URU4000B scan
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    Free SDK uru 4000b Digital Persona USB Biometric F... SKU : 32353252060
    Special Price US$50.12 Regular Price US$55.69
  19. Keyless Electronic Door Lock Invisible Intelligent Lock With Remote Control & Fingerprint Touch
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    Keyless Electronic Door Lock Invisible Intelligent... SKU : 32904896790
    Special Price US$105.82 Regular Price US$117.57
    Out of stock
  20. Wireless RFID Facial Recognition Elevator Entry System with Elevator Access Control Panel
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    Wireless RFID Facial Recognition Elevator Entry Sy... SKU : WCAM101119340567
    Special Price US$224.70 Regular Price US$249.67
  21. 433MHz Wireless Remote Control Switch 2CH Relay Receiver Module + Learning Code 1527 Transmitter rem
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    433MHz Wireless Remote Control Switch 2CH Relay Re... SKU : 32826660666
    Special Price US$2.76 Regular Price US$3.07
  22. Xiaomi Aqara Cube Controller Zigbee Version Controlled By Six Actions Works With Xiaomi Mijia Gatewa
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    Xiaomi Aqara Cube Controller Zigbee Version Contro... SKU : 32868094598
    Special Price US$15.21 Regular Price US$16.90
  23. Human Head Non-Contact Entrance Guard Infrared Head Temperature Mask Detection Scan Time Attendance Access Control Terminal
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    Human Head Non-Contact Entrance Guard Infrared Hea... SKU : WCAM101119340594
    Special Price US$272.24 Regular Price US$302.49
  24. Danmini A3 sliver fingerprint reader biometric door lock with thumbprint scanner DC 5V/1A color TFT
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    Danmini A3 sliver fingerprint reader biometric doo... SKU : 32839005533
    Special Price US$21.63 Regular Price US$24.03
    Out of stock
  25. Electronic Intelligent Bluetooth Fingerprint Password Padlock Home Door App Remote Management Mobile
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    Electronic Intelligent Bluetooth Fingerprint Passw... SKU : 32960172665
    Special Price US$13.65 Regular Price US$15.16
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  26. Good Quality High Speed Face Time Attendance Face recognition Time Clock With Fingerprint Door Acces
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    Good Quality High Speed Face Time Attendance Face ... SKU : 32884175790
    Special Price US$36.29 Regular Price US$40.32
    Out of stock
  27. 5 Inch SIP Two Way Talk Face Reader Free API Sdk NFC Time Attendance Door Access Control System
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    5 Inch SIP Two Way Talk Face Reader Free API Sdk N... SKU : WCAM101119340618
    Special Price US$95.07 Regular Price US$105.63
  28. Linux 5 Inch Wireless Wired Time Attendance Card Reader 13.56mnz NFC RFID Door Access Control System Face Reader Free API/Sdk
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    Linux 5 Inch Wireless Wired Time Attendance Card R... SKU : WCAM101119340604
    Special Price US$99.39 Regular Price US$110.43
  29. One to Three Video Intercom system 1 Camera 3 Monitors Wireless Wifi Fingerprint RFID Password Video
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    One to Three Video Intercom system 1 Camera 3 Moni... SKU : SY705BMJFR11-1
    Special Price US$336.20 Regular Price US$373.55
  30. WiFi 8 Inch Touch Screen MIFARE Card Reader Face Scanner for Access Control
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    WiFi 8 Inch Touch Screen MIFARE Card Reader Face S... SKU : WCAM101119340548
    Special Price US$163.34 Regular Price US$181.49
  31. Mountainone 7 inch One to One Wired Wireless Wifi Fingerprint RFID Password Video Door Phone Doorbell
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    Mountainone 7 inch One to One Wired Wireless Wifi ... SKU : SY709BMJF11
    Special Price US$171.28 Regular Price US$190.31
  32. Stainless Steel Exit Button Automatic Door Open Exit Button
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    Stainless Steel Exit Button Automatic Door Open Ex... SKU : NORDS101023510009
    Special Price US$2.32 Regular Price US$2.57
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