TW-2213：
Featuring consecutive measurement, direct point-sampling and high accuracy of orientation, with mechanical hairspring being leveled at the reflecting point of human cornea.
Using high-definition line-shaped sensor, advanced intellectualized electronic system and digital display to make testing result more visible, legible and accurate.
LED light source and low power consumption make battery life prolonged.
+2.00D eyesight compensation
Accuracy self-check function
VD measurement function
Many technology and design patentsMAIN TECHNICAL INDEXES
1、Range of measurement：Binocular pupillary distance: 45～82 mm
Left or right pupillary distance: 22.5～41 mm
Indication error： ≤0.5 mm
Rounding error： ≤0.5 mm
Distance of target： 30 cm～∞
Power source： Voltage：DC 3V
Specification：5# AA battery
Quantity：2 pieces
Time for automatic shut-off：
About 1 minute after stopping operation, or turn it off manually.
Size： 233mm(L)×165mm(W)×70mm(H)
Weight： 0.68kg

TW-2213A：
Product characteristics:
Main feature use exactitude optical configuration,measure more
correctly,with adjustable knob,adjust the dista.

standard:
Method of measurement:cornea reflction light coidence method
Rang of measurement:44 to 83mm (both eyes),22 to 41.5mm (each eye):
Graduations:0.5mm
Range of focusing point:30 to infinity

Technicel parametars:
Power supply:6V DC (lr03 batteriesX4


TW-2213B：
Product characteristics:
Main feature use exactitude optical configuration,measure more
correctly,with adjustable knob,adjust the dista.

standard:
Method of measurement:cornea reflction light coidence method
Rang of measurement:44 to 83mm (both eyes),22 to 41.5mm (each eye):
Graduations:0.5mm
Range of focusing point:30 to infinity

Technicel parametars:
Power supply:6V DC (lr03 batteriesX4
WEIGHT:0.8KG