With quality and precision engineering built in, the TW-1450E Manual Refractor offers outstanding quality at an affordable price. 
Easier refractions with the specialized cross cylinder synchronization feature. 
Available colors: Black or white
Available in plus or minus cylinder
 
Specifications
Sphere powers range: +16.75D to -19.00D, with a minimum reading 0.25D or 0.12D (When +0.12D auxiliary lens is used).
 
Sphere powers range: +26.75D to -29.00D (When optional ±10.00D lens is used).
 
Cylinder power range: +/-  0 to 6.00D, with minimum reading 0.25D or 0.12D (when auxiliary lens is used) or 0 to 8.00D (when 2.00D auxiliary lens is used).
 
Astigmatic axis scale: 0 to 180° in 5° steps.
 
Cross cylinder:±0.25D, reversal type (synchronized with astigmatic axis).
 
Rotary prism: 0 to 20ΔD in 1ΔD steps.
 
Interpupillary adjustment: 48mm to 80mm in 1mm step (right and left synchronized).
 
Forehead rest adjustment: 16mm backward and forward.
 
Accessories : Near card and rod, phoropter cover, auxiliary lenses.