The Metal Bird Feeder provides an effective and humane way of protecting your bird feeder from squirrels and larger, heavier birds.The metal bird feeder is made of metal net and plastic cover,all the bird feeders comes ready to hang and easy to fill and clean.
Metal Bird Feeder Metal Bird Feeder,White Metal Bird Feeder,Multicolor Metal Bird Feeder,Multi-Use Hanging Metal Bird Feeder Huanghua Fengyi Honde Metal Factory , https://www.hd-petproducts.com
So it is Eco-friendly.
DMP series surface tension measurement experiment device manual
The instrument is used to measure the surface tension by the maximum bubble method, without mercury pollution, safe and reliable. The instrument adopts single-chip measurement system; high precision and easy to use. The sensor adopts imported precision differential pressure sensor. The core of this instrument is the intl89C51 chip, which can also be interfaced with a PC. (Users can specifically point out when ordering)