Easy to use - just squeeze ball handle, put gauge on cable, release handle and read tension on rotation dial. No conversion charts necessary. 
Tension range: 
12-19200 - 10–70lbs. for 1/16” cable, 15 - 70 lbs. for 3/32 & 1/8” cable. 
12-19210 - 50-350 lbs. on 5/32” & 3/16” cable.
Only 3-1/4” wide. Fits through inspection hole.