On June 4th I bid on and won an Audio Control Industrial SA3050 real time spectrum analyser , unfortunately the add read Unable to test for parts only, Hmm should I gamble? anyway I go for it because the add showed the item would power up and unless it had bad issues wouls not work,( this was much to the schigrin of Mrs 24 track . I was watching the same unit with Hi SPL mic go for almost 600.00 CDN the day before, a little investigation found a good used one of this model USUALLY goes for about 1,000.00 US and the factory is just over the border into Washington state. So I bite, and 65.00 later I now own this Maybe working RTA , Move ahead to June 11, Canada Post arrives with a small but heavey box , Inside , you guessed it is my RTA , plug it in , press the on button , it lights up, take a XLR mic cable plug it in with the Electrovoice RE20 turn up the sensitivity and Viola, many dancing LEDs , I am stoked !!! plug in the Pink noise output into an amp and all fires up ( UNFRICKEN REAL) all works , the ranges are correct and responsive and the SPL meter is dead accurate , this unit has the printer option installed, so I can print out the frequency responces , plus it has 6 internal memeories , I am happier than a pig in Shrit. this is a heavey duty piece of scientific equipment not a toy like most are on the market , this unit is portable but i can get the 19"rack mount feature from the factory if I want to. I do need to clean this unit up ( you know scratches et al) so I may paint the cab and I will contact the factory to see about the other options available , I cant believe I got this for 65.00 US ( 83.50 CDN) Way too cool! now I can analyze about 5 studios Im helping putting together!