lautering flow rate

Almost up and running on my new single trier system and I was looking to monitor/ control the flow rate out of my MLT. I was able to find a reasonably priced flow rate monitor ($84) however its only rated to 150*. What methods do you guys use to control your flow rate other than the crack the valve and measure/ time your runnings.( I always seem to have trouble hitting my Target rate like this)

are you fly sparging or something? if so i can't add much because I only batch sparge, so my 'flow rate' doesn't matter. fast as I can get without bits of grain/husk slipping through my SS braid.

yes, flow rate is a factor used in fly-sparging

Sorry I should have mentioned. Yes i am fly sparking, I have a blichmann mash tun and spare arm so if i can control my flow out I will be controlling my flow in. I was wondering if anyone in HBT land had any clever ideas for controlling my lautering rate.

Are you looking to 'control' or 'measure' the rate?
I measure my rate of fly sparging and then manually adjust the outlet valve to control it.

The scale measures weight and transmits this to the RS232 port of my pc where I wrote a VB app to convert this to weight/time => flow rate.

I use a variable area flow meter. As long as you dont run boiling hot wort through it, it'll work just fine. I laughter around 1/2 gal per minute. And I recirculate at the same rate. Here's one from Dwyer. http://www.dwyer-inst.com/Products/Product.cfm?Group_ID=608&Product_ID=997&sPageName=Ordering