The Ohaus Starter 400M Portable pH & Conductivity Meter (ST400M-B) is a durable, waterproof, battery-operated multi-parameter meter ideal for field testing pH, conductivity, TDS, salinity and resistivity. This configuration ships without probes, for field teams equipping their own electrodes.
Measurement Range
-2.00 to 16.00 pH; 0 to 199.9 mS/cm conductivity; 0.1 mg/L to 199.9 g/L TDS
Resolution
0.01 pH; 0.1 uS/cm; 0.01 mg/L
Accuracy
+/-0.01 pH; +/-0.5% F.S.
Housing
IP67 waterproof
Battery
Rechargeable lithium, 40 hrs runtime
Frequently Asked Questions
Q: How long does the battery last? A: The rechargeable lithium battery provides up to 40 hours of continuous use and more than 300 charge cycles.
Q: Is it suitable for outdoor field use? A: Yes, the IP67 waterproof housing, rubber cover, and IP67-rated probes are built for prolonged field use.
Q: What is the difference between the -B, -F, and -G models? A: -B ships without probes for labs using existing electrodes; -F includes the ST320 pH electrode and STCON3 conductivity probe; -G adds a carrying bag to the -F kit.
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