Ethernet module (field installable)$473.00 For 6651, 6681 Call us for a quote Product Model: 0554 6656 Ethernet module (field installable) quantity Add to cart SKU: 0554 6656 Category: Testo Sensors Parts & Accessories Tag: Testo Sensors Parts & Accessories Related products Self service replacement CO measuring sensor – 325-1 & 325-3 only0 out of 5 $219.00 Add to cart TC with tube and plug NiCr-Ni0 out of 5 $366.00 Add to cart NO low replacement sensor (0-300 ppm 0.1 ppm resolution)0 out of 5 $868.00 Add to cart