Field Notes
Sorbent Tubes for Air Sampling: How to Choose the Sorbent, Tube Size and Flow Rate in Canada
A sorbent tube is a glass tube of solid adsorbent that a pump draws air through for lab analysis. See which sorbent, tube size and...
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Tedlar Gas Sampling Bags: How to Choose the Right Size, Film and Valve in Canada
A Tedlar bag is a gas grab sampler you fill to about 80% of its nominal volume. Compare the 18 sizes ERE stocks, when Tedlar...
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Salinity Meters: How to Choose the Right Format and Read ppt, PSU or Specific Gravity in Canada
A salinity meter measures conductivity and calculates salinity in ppt, PSU or specific gravity — compare the portable, bench and multiparameter meters ERE stocks, plus...
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Chlorine Meters: A Buyer's Guide for Canada
Compare free and total chlorine meters for water treatment compliance — DPD colorimetric method, accuracy, calibration and 3 real ERE-stocked models.
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TDS Meters: How to Choose One, Set the Conversion Factor and Calibrate It in Canada
How to choose a TDS meter: the conversion factor, low- vs high-range models, calibration standards and temperature compensation, with the Hanna and Ohaus testers and...
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4-20mA Pressure Transmitters for Water Level: How to Choose, Scale and Verify One in Canada
How to choose a 4-20mA pressure transmitter for water level: range and accuracy, scaling mA to metres of water, loop power, vented cables and verification...
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ORP Meters: How to Choose and Verify an Oxidation-Reduction Potential Meter for Water Testing in Canada
How to choose an ORP meter for field water testing: pocket, portable and bench formats, ORP electrodes, verification with test solutions, and why redox readings...
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pH Meters: How to Choose a Pocket, Portable or Bench Meter for Water Testing in Canada
How to choose a pH meter for water testing: pocket testers, portable meters and bench meters compared by accuracy, electrode type and calibration, with the...
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Dissolved Oxygen Meters: How to Choose One for Field Water Monitoring in Canada
How to choose a dissolved oxygen meter for field water monitoring: optical, galvanic and polarographic probes, range, compensation and calibration, with the instruments ERE carries...
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