Does meter come with calibration certificate?

Usually, in a situation such as this, a company will have one device that has been calibrated at NIST, and they will compare all their other meters to this device. Hence, NIST traceable. I don’t know what level of accuracy they state, but I bet that even without a certificate, an accuracy of 3-5% range is achievable with a consistent manufacturing process. That is also why they can give you a response curve that works for this model. Whether this is good enough for your application is the determining factor to its acceptability.

Is the probe waterproof? I need to measure fluence in a water sample that has light beaming on it.

Do not believe this is specifically waterproof beside you really need a spectrometer like an ocean optics with the curveette holder and a light source

Brand	General Tools
Model Number	UV512C
Product Dimensions	7.32 x 27 x 26.67 cm; 22.68 g
Are Batteries Included	Yes
Item Weight	22.7 g

General Tools UV512C Digital UVC Meter, 220-275 nm

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