eTape16 ETBT16.75-DB-RP Digital Tape Measure, Bluetooth, Polycarbonate, 16', Red Use the same features and benefits as the eTape16 The only digital tape measure in the market that uses "Auto-Chx" calibration eTape16BT comes with eTape16 eSmart spreadsheet application available on google play or Apple Store The eTape16 BT allows one to take measurements and then automatically and accurately send them to their Android smartphone, or iOS device eTape Construction app is great for builders and DIYers. It records measurements into a cut list and all marks it complete as you cut.