3M 13991, Venture Tape Aluminum Foil Tape 1520CW, Silver, 63.5 mm x 45.7 m, 3.2 mil, 7100169857 
Insize 0431-0018, PORTABLE pH METER, -2.00~18.00pH, 6974029777011
$725.90
Resolution 0.01pH
Accuracy ?0.01pH
Reading mode: auto-read and continuous-read
Automatic/manual temperature compensation
Auto-hold feature senses and locks the measurement endpoint
1 or 2 points calibration with standard recognition
Data capacity up to 200 sets for each parameter
