NO upgrade module (0-3000 ppm high range 1 ppm res) For Testo 330-1 & 330-1-LL, 330-2 & 330-2-LL Call us for a quote SKU: 0554 3922 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Description Description For Testo 330-1 & 330-1-LL, 330-2 & 330-2-LL Related products CO replacement sensor (0-10000 ppm H2 compensated)0 out of 5 $1,122.00 Add to cart CO2 replacement sensor kit with board0 out of 5 Read more SO2 replacement sensor (0-5000 ppm)0 out of 5 $986.00 Add to cart