Atago 4810 PAL-1 BLT Pocket Refractometer with Bluetooth Atago 4811 PAL-1 BLT/i Pocket Refractometer with Bluetooth Available Options Atago 3810A PAL-1 Bluetooth (Android/Windows) Pocket Refractometer Available Options Atago 3810i PAL-1 Bluetooth (iPhone) Pocket Refractometer Available Options Atago 3810 PAL-1 Digital Hand-Held "Pocket" Refractometer