S.A.M. Mark VIII “The Original Spinal Analysis Machine”, old-school with pneumatic pump to let the person you're screening see what it feels like if you "level them out" (e.g. pump up their low side). It's a beast - pretty heavy but built like a tank. Missing the left lower "ruler" to measure pelvic height difference but could use a yardstick. I've sent a message to manufacturer to find out if a replacement is available. These things are still being produced and sell for $3,347 plus tax at Scripphesco. Includes free-standing poster holder and posters. Asking $400 plus you pay shipping. Better to pick up locally in Northern California, about an hour north of San Francisco.