Sad night for me last night.
On a late night service call with my SMAN 3 connected to the condenser getting SC and SH when I had to run to the truck. As I'm walking back from the truck, the H/O calls me and I head inside to see what the concern was. Well, after I calm the guy and his wife down and tell them to sit back and let me work a little, I head back outside and discover that it has started to rain. I run to the rear of the house to protect my gauges and when I get to them I notice that they're reading over 400 psig ON BOTH lines!
Disconnect them and put them in the truck. Later as I'm packing up to leave, I turn them on to see if everything is okay and discover that they're reading pressure without being attached to a line! They even read pressure without the hoses attached!!! Attempted to calibrate them and now the high side just reads OL while the low side is still fluctuating.
I just hope that my local supply house allows me to return them and get the Testos.