Can i use this in the sump of my aquarium rack, by just mounting the sensors in the water in the sump? ie not inline in an ro/hma system?

There are 2 problems. The sensors are calibrated to be used as advised and in open water they will give much higher readings as well as having the uncertainty of their durability. The latter issue is not a short term problem as they are just 2 probes on the end of a pair of wires. It all depends on what you want to achieve.

Tds meter should 2 digit result. should this be 3 digit? e.g 000ppm ??

Its a 3 digit readout on an instrument with 2% accuracy. Do not confuse accuracy and precision. Accuracy is how close to the correct result is it? 2% is 2 parts in 100, so some of second digit and all the third digit are wasted. It can determine only 50 TDS steps. Precision is what does it display? The display has 1000 steps, so its very precise. That is 0.1% precision.

I have an RO unit with a post filter to reinstate minerals, should this be installed before the post filter? Or will readings be affected?

I have mine after the water comes out of to unit I think if you put post filter all minerals could be filtered out

Trying to recalibrate while disconnected from RO unit but the in and out probes give different readings, why?

The probes have to be in the pipe to read. They will not give a “correct” reading if pulled out of and say placed in a cup. You would need to use the T connectors and loop a piece of pipe around

Product Dimensions	4.83 x 2.03 x 7.62 cm; 45.36 g
Part number	DM-1
Item display height	0.8 inches
Item display length	3 inches
Item display width	3 inches
Item display weight	79 g
Material type	Plastic
Power source type	Battery Powered
Manufacturer	HM Digital, Inc.
Item model number	716186
ASIN	B001EHAZGW

HM Digital DM-1 in-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy

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