200000
They have all done poorly in long term testing. I am surprised they are still for sale. many found out the hard way. Sorry, but I would n't recommend getting any of these types of pest repellants.
industrial applications of ultrasonic waves: 1. ultrasonic welding 2. ultrasonic cleaning. 3. ultrasonic drilling. 4. ultrasonic soldering. +++ 5. Flaw detection in metals etc. And many others if you stretch the term "industrial to include, say, medical!
3
Today the average is 790000 people :D
About 12.5 millions people are without Job today.
how many people work in the war memorial today how many people work in the war memorial today
to many....
How many people live in fawkner today
Approximately 476,892.765 people had coke today
there are about 135 people in slavrey
Many - fish finders, many sonar devices.
Ultrasonic gauges need to be replaced every couple of years depending on how many times they are used. They are easily replaced so why not do it when you feel their usefulness is done.