KSH 253201 KSH 163044
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Huepar Multi-function Travel Camera Tripod 56"/143cm Adjustable Laser Level Tripod with 3-Way Swivel Pan Head With Bubble Level
NJTY T400A T600A High Precision Infrared Thermometer, Water Thermometer, Baking and Kitchen Industrial Thermometer
Fresnel lens Infrared induction 100° induction angle 7M distance PIR lens high sensitivity Infrared sensing of human body
Holographic diffraction grating 36x38mm 600 lines 1mm grates Optical teaching experiment Transmission grating No shell