Radian clock


Details:
1) Provide an accurate reading for the optional refractive index
2) Automatic on / off
3) Memory function to keep previous measurement
4) With regularly replaced button cell
5) Portable design
6) Rounded measuring tips to protect the lens
7) High quality environmental materials
8) Durable for a long time

Measurement scope: +/- 20.

Dimensions: 2.5 in / 6 cm
Weight: 2.95 oz / 84 g