Does this Rescucender grab the rope with cam action (won't damage rope) or does it have spike teeth which could dig in and damage rope?

To my knowledge the rescucender is the only cam rope ascender/arrester that doesn’t damage a rope under a shock load. It was originally designed by Rock Thompson in 1989 based on the “Soloist”, another rope arresting device he designed as a self-belay for rock climbers. I personally conducted drop test back in the “90’s” when I worked for the University of Nevada Reno’s industrial fire school using the original design and we had no rope damage. I still teach rescue work and I still use rescucenders. We have been using them to acsend ropes and to tighten high lines for years. And there were other’s that also did test with the rescucender and they published their results with similar findings. There is a YouTube clip of one damaging a rope but if you look at the cam it is severely wore and damaged and should never have been used. This new design is really great as there is no more the little wire that people have gotten twisted or wrapped around the rope. I love this new design and the rescucender (both the original and new design) is the only hard ascender I use in rescue work. (Soft ascender being cordage loops tied onto a fixed line using an ascender knot, ie Prussic, Kliemheist, Bachman, etc.) However... High angle rope work is always dangerous, people working in this environment need to obtain professional training and always plan for the unexpected to occur and not totally rely on one piece of gear; always remove any slack in your rope systems to prevent or minimize your chances of having a shock load on your rope system. (My CYA Statement) YIS (Yours In Service)

Can this work as an up and down control for roof work? Please advise if I need another type of controller?

I'm not sure what you mean by up and down control. This is a device that grips the roop and lets you ascend normally but you can't descend without manual intervention. (You have to hold the lever to let the rope out. As soon as you release the lever, it grips the rope.) If you are working on a roof with a rope affixed to the apex, then it would keep you from falling as long as you were disciplined enough to keep the rope snug in case the tension isn't enough to pull it out for you.

Is this device mid-line attachable?

Yes, you can put the rescucender on the rope whenever and wherever you want. You just have to remove the carabiner in order to put it on or take it off.

ASIN	B01F8JBPV0
Batteries Included?	No
Best Sellers Rank	#105,533 in Sporting Goods ( See Top 100 in Sporting Goods ) #38 in Climbing Belay & Rappel Equipment
Brand	PETZL
Color	Red (Red)
Customer Reviews	4.8 4.8 out of 5 stars (196)
Date First Available	10 May 2016
Department	Unisex
Included Components	petzô
Is Discontinued By Manufacturer	No
Item model number	B50A
Manufacturer	Petzl
Material Type	Aluminium/Stainless Steel/Nylon
Number of Items	1
Number of Pieces	1
Power Source	1
Product Dimensions	14 x 5 x 9 cm; 260 g
Season	Year-round
Size	One Size
Sport	Climbing
Style	Rescuecender
Usage	Climbing.

B50A RESCUCENDER Openable Cam-Loaded Rope Clamp

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