I've recently discovered that Testo have released a new 550 digital manifold to replace the 523. It sounds and looks good at a descent price. £300 for the manifold and 1 clamp on probe or £350 for the kit that includes 2 probes and a box.
Before I commit to buying, could somebody tell me if they have had any experience using one of these and where would be the cheapest place to purchase one?