I carry a very good quality light meter from Hydrofarm (I started doing so at the recommendation of folks here), and it is excellent for the orchid grower.
I am not so "hot" on the accuracy of over-the-counter, analog humidity gauges. I have used them, but they are often as much as 10% off. I have checked a few using a NIST certified one (don't even ask about the price of those - mine was a gift from a former boss), and while some can be quite good, another, identical one can be off.
I stated carrying a digital hygrometer/thermometer a short while ago, and it is getting good reviews from customers.
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