Sand Hourglass Kits S3617f5a9bc0f4c8bb4e9802233dfc636a.jpg DIY Digital 24 Hour Clock Soldering Practice Kit (HH : MM : SS Display DAOKAI Electronic Hourglass Led DIY Kits PCB Soldering Practice Board. Feature: Model: EH 30 Working voltage: DC3. 3 5V or 3*AA battery Speed: Adjustable PCB size: 74. 4 x 43. 7 x 24mmColor: Red LED Package includes: 5 x DIY Electronic Hourglass KitFinish assembly, for reference only.
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5Pcs DIY Electronic Hourglass Kit Soldering Practice Spare Parts DC3.3-5V Speed Adjustable