can't find I2c sensor register hex

Projects Networking, Protocols, and Devices
2

And this is the way i tried to cover register hex
for (b=0x00;b<=0x99;b++){

Wire.beginTransmission(0x39);
Wire.write(b);//
delay(100);
Wire.endTransmission(0x39);
Serial.println(Wire.read());
delay(150);}