Boonton 9231 Single-Channel RF Voltmeter 10Hz–2.5GHz Test Measurement Instrument 146449968456 but received an error message

but received an error message that indicates the right and left motor is not accessible

Manufacturer Keyence Model Number QS-10P

Manufacturer Crestron Model Number TSW-760-W-S SKU 19-78933 Ref 23-120084

Manufacturer Roland Model Number E-10 SKU 19-51302 Ref 23-74872

Boonton 9231 Single-Channel RF Voltmeter 10Hz–2.5GHz Test Measurement Instrument 146449968456 but received an error messageCondition Used Description This item is fully tested and in excellent working order. Item will come with a 30 Day Warranty. Cosmetically in good condition showing minor scuffs scratches blemishes from previous use. Includes Single Channel RF Voltmeter 10Hz2. 5GHz Test Measurement Instrument as pictured. No additional items or accessories are included. Unless pictured, no power adapter power cable included. Photos are of the actual unit for sale.