General Tools DOM22CERT - NIST Calibration Certificate - Dissolved Oxygen Meter provides automatic temperature compensation. This dissolved oxygen sensor comes with a Precision Polargraphic Probe for DO. Formerly Mannix Instrument. Discontinued product.

General Tools DPH208RCERT - NIST Calibration Certificate - pH Meter offers a wide range of applications including: pools,aquariums, labs, aqua culture, water testing and much more. The water quality testing meter measures pH from 0 to 14.00 pH. Formerly Mannix Instrument.

General Tools DPH8690CERT - NIST Calibration Certificate - Field Calibratable pH Instrument simultaneously displays pH and temp. The field calibratable pH instrument has an automatic calibration at the touch of a button. Formerly Mannix Instrument.

General Tools DPT300ECERT- NIST Calibration Certificate Digital Thermometer is a digital Anti-roll Thermometer. It has time-saving instant one-second updates.

General Tools DPT392FCCERT Digital Pocket Thermometer is a Digital Pocket Min to Max Thermometer. This digital probe thermometer is water resistant.

General Tools DSM325CERT - NIST Calibration Certificate - Digital Sound Meter comes with real time display. This small size sound and noise level meter provides high performance at economic cost. Formerly Mannix Instrument.

General Tools DSM8922CERT - NIST Calibration Certificate - Digital Sound Meter, with its background noise absorber, is a very efficient sound level meter. General Tools DSM8922CERT Digital Sound Meter is able to perform as an optimum noise level meter. Formerly Mannix Instrument.

General Tools DST570CERT- NIST Calibration Certificate Digital Stem Probe Thermometer is a Digital Surface Probe Thermometer (high range). It features a 1 sec normal temperature sensing time.

General Tools DT160ACCERT - NIST Calibration Certificate Digital Laboratory Thermometer has a temperature alarm function with high and low limits. This digital probe laboratory thermometer has audible and visual alarm set points. Formerly Mannix Instrument.

General Tools DT307CERT - NIST Calibration Certificate - High Temperature Thermometer is a Digital Thermometer High Temp MINI. General Tools DT307CERT High Temperature Thermometer is small and easy to use. Formerly Mannix Instrument.

General Tools DT310LABCERT- NIST Calibration Certificate Digital Stem Probe Thermometer is a Digital Lab Thermometer. This digital probe thermometer comes with Stainless steel probe and sheath. Formerly Mannix Instrument.

General Tools DT510LABCERT- NIST Calibration Certificate Digital Stem Probe Thermometer is a Digital Lab Thermometer. This digital probe thermometer comes with a stainless steel probe and sheath. Formerly Mannix Instrument.