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The Bios Defender 520H by Mesa Labs is a primary liquid-free gas flow calibration standard offering a high-flow measurement range of 0
background-attachment:scroll} The TSI 964 Thermoanemometer Straight Probe is a plug-in probe for the VelociCalc 9565-P meter
With measurement ranges of 0–500 ppm CO
ToxiRAE Pro Cl₂
TSI 985 High Concentration (PPM) VOC and Temperature PM2.5 / PM10 The Bios Defender 520H byThe TSI 985 is a high concentration VOC and temperature probe compatible with TSI VelociCalc and Q Trak portable digital meters. It measures volatile organic compounds from 12,000 ppm (up to 10 ppm resolution) and temperature from 14140F 1060C (0. 1F C resolution, 1. 0F accuracy). This gently used probe was purchased in 2012 and was last calibrated 6 3 2019; it is available for purchase only.
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