I didn't read this whole thing but I posted on one of the other ones about it. I'm with jp h 10 all the way, a little cumbersome but it will never leave you hanging . I've never knock on wood had a leak I couldn't find with it .
I too have wasted money on a d tek. I used an old 115 v h 10 for years no problems. Since i started using the d tek I have missed several. I just sent my h 10 off to be rebuilt may still use my d tek sometimes but will always get my h 10 out for the hard to find ones.
Just bought a new d-tek select as my old one was giving too many false possitives. Not sure yet if it will work any better, but something I did notice about the d-tek is it will not pu on weak concentrations of refrigerant. Added 1/4Lb R-22 and ran up 200psi w/nitro. Didn't pu a peep, pulled a vacuum and it started to leak down. Juiced up again w/nitro and found large leak at evap(mh quick connect) and one at the suction line at comp with soap.
crap... this may be my problem .. using a D-tek, cannot find a problem R-22 leak. added 5 oz R-22, 200 psi nitro ... D-tek barely picks it up when I did a test at port.
just serviced my old H-10B with General Electric logo in front.
hopefully H-10B will do better than D-tek.
Had a young tech over the house this evening, he likes to visit and ask lots of questions (he thinks I'm a lot smarter than I am). He was having problems w/his tek-mate being too sensitive (he thought). Any way, he got it out and I ran it past my gauges, and it picked up on one hose. I tried it out several times, and it only went off on the one connection. I pulled out my D-tek select, the new one, and it wouldn't pu the scent. I thought the tek-mate was inferior to the select. Anyone else ever compare the two? I'm saving my $ for an H-10, just curious about the tec-mate.
I have a JB LD-5000 that I use and let some other contractors use. Have not had any complaints and have not yet not be able to find a leak. Its able to adjust sensativity range and can show you the intensity of the leak. Plus the handle starts to vibrate when you start getting close to the leak. Works on most refrigerants from HFC to HCFC. You can look it up on JB's website.