Laser Safety Glasses - Power Meter
For laser power meters in a price range of less than 500 USD, it will not be very accurate and endurable. It may stop working in 7-14 days. Also, it is very necessary that the laser power meter could detect special wavelengths. For example for diodes, it is usually 400-1000 nm. For DPSS it is 1064 nm. For the Co2 laser, it is 10600 nm.