In our experience field studies test equipment needs to be waterpoof, easily portable and supplied complete with everything needed to perform the measurement.
1. Is the meter waterproof?
This is, we feel, perhaps the most important criteria. In the field, the occasional accidental immersion in the nearest river or pond isn't unheard of, or just getting caught in the rain is enough to cause a problem with a non waterproof meter. By choosing a waterproof meter, any risk of water damage is removed.
2. Is the sensor exposed or protected?
Especially important when looking at a pH electrode. Is the glass measuring bulb protected within the body of the plastic electrode or meter casing? If it is, then there is less chance of a breakage - useful when measuring the pH of rivers or lakes where damage resulting from contact with the riverbed or bottom of lake can occur.
3. Does it run on batteries?
There is often no mains power where you need it, or if being using in field studies battery power is essential - the other thing to look out for is the battery life, you don't want to be using a meter whilst on a field trip only to find that it stops working half way through the week due to flat batteries.
4. Is it supplied complete?
Many meters are only supplied with a basic sensor, and it is only when in the field that you realise you need calibration solution, chemical reagents, measuring cylinders etc. When choosing a field studies instrument or test kit just stop and check that everything you need is included.
