Wide, dual measurement range with auto-ranging feature quickly switches you to the highest resolution
TDSTestr 30 features 0.1 resolution below 100 ppm and 1 ppm resolution above 100 ppm
TDSTestr 40 features 0.1 µS resolution below 200 µS and 1 µS resolution above 200 µS
Microprocessor-based
Easy two-point push-button calibration
Automatic Temperature Compensation
Hold function; Auto-off; error messages

The TDSTestrs 30 and 40 feature a lower range and higher resolution for more precise measurements at low conductivity or TDS values.

Click below to download Acrobat (.pdf) file of:
TDSTestr 10-40 product bulletin
TDSTestr 30-40 manual
Tech tip: TDSTestr Comparison Chart

TDSRange	WD-35661-57 0 to 99.9 ppm and 100 to 999 ppm WD-35661-59 0 to 199.9 µS and 200 to 1999 µS
TDSResolution	WD-35661-57 0 to 99.9 ppm and 100 to 999 ppm WD-35661-59 0 to 199.9 µS and 200 to 1999 µS
Accuracy	±2% full scale
Calibration	Two points push button (one per range)
ATC	Yes, 2%/°C
Electrode	Built-in
Operating Temperature	0 to 50°C (32 to 122°F)
Power	Four 1.5 V batteries
Battery life	20 hours continuous use
Dimensions	5.875" x 1.5" x 0.75" (15 x 4 x 2.5 cm)
Shipping weight	4.5 oz (125 g)

TDSTestrs 30 and 40 from Oakton

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