I bought one a while back from Tandy. They do 2 types, analogue or digital readout. I have the digital type and have used it successfully for RC. I can't remember the price - about �20 I think (bought it about 5 yrs ago). Alternatively, if you have good relations with a local Meridian stockist they will lend you one.

818v8, HD621, 5200SE front, 5200SE centre, 3200 rear, SkyQ