WTW Ph Elect Sentix 940 Unit EA. You simply need to read the data off of the electrode and put it into a buffer containing the indicator and that's it. No more having to probe around with a probe and then dip it in the acid or solution and then wipe off the electrode. With Sentix 103740 electrode you just need to put the probe in the acid and wait for it to buffer the acid and then wipe the sensor and dip it in a buffer and wait for it to buffer. Specifications for WTW Ph Elect Sentix 940 103740: Catalog number: 97042-836 Type: EQUIP PARTS AND ACCESSORIES ONLY Description: PH ELECT SENTIX 940 Supplier Number: 103740 Package Contents: WTW Ph Elect Sentix 940 103740 / 97042-836 The WTW Ph Elect Sentix 940 103740 is a quality addition to the WTW lineup. For more great deals on pH Meters by WTW please browse our WTW pH Meters page. WTW Ph Elect Sentix 940 103740 Unit EA