Havit P1 Portable Singing Home Wireless Bluetooth Speaker Microphone Set, Dual-microphone thermolyne muffle furnace Outer blade apex angle (degree):

Outer blade apex angle (degree): 90

Integrated attenuator filter wheel to accommodate various optical filters required for different transmitted light applications

and the brand offering the unit

like all laboratory equipment

com/products/digital-anemometer-by-labpro

Havit P1 Portable Singing Home Wireless Bluetooth Speaker Microphone Set, Dual-microphone thermolyne muffle furnace Outer blade apex angle (degree):Features: 1. Wide range of compatibility 2. Composite diaphragm, matching professional acoustic power amplifier IC, release surging sound 3. Intelligent EQ acoustics, HIFI level sound quality 4. The speaker has built in RGB lights and four ambient light modes to create an atmosphere 5. Sensitive radio, better singing 6. Adopt 2. 4G wireless transmission technology to realize long distance interactive interconnection 7. Bluetooth 5. 1, stable link