Hagner TP200 Digital Photometer

The Hagner Digital Photometer, model TP200, is a small, handy and extremely easy-to-use instrument for accurate measurement of illuminance. It has two ranges for measurement of both metric, lux (Ix) and imperial, footcandle (fc) units. The scales are chosen by setting the switch above the digital display. The sensitivity ranges are 0.1-200,000 Ix and 0.01-20,000 fc. With both automatic zeroing and on/off switch, the only controls needed are a four-position range selection switch and a hold button for retaining the display value.

Instrument data for TP200/TP200-X
Detector        :Silicon photodiode, Vλ-filtered and cosine corrected
Measuring range        :0.1- 200,000 Ix and 0.01-20,000 fc
Accuracy        :Better than ±3% (±1 in last digit)
Power supply        :9 volt battery type PP3 alkaline (lifetime = 350 hrs)
Temperature drift    :<10°C +0.35% / °C >30°C -0.35% / °C
Dimensions        :135 x 75 x 35 mm
Weight            :TP200: 0.19 kg
TP200-x            :0.22 kg (0.48 kg with carrying case)